SỰ ĐỒNG BIẾN, NGHỊCH BIẾN CỦA HÀM SỐ VÀ BÀI TẬP FILE WORD - THẦY ĐẶNG VIỆT ĐÔNG

<style>/*<link href='https://www.blogger.com/dyn-css/authorization.css?targetBlogID=8528942724897127701&zx=b709bd96-49a2-4338-96c5-09fb72beaebe' media='none' onload='if(media!='all')media='all'' rel='stylesheet'/><noscript><link href='https://www.blogger.com/dyn-css/authorization.css?targetBlogID=8528942724897127701&zx=b709bd96-49a2-4338-96c5-09fb72beaebe' rel='stylesheet'/></noscript>
<meta name='google-adsense-platform-account' content='ca-host-pub-1556223355139109'/>
<meta name='google-adsense-platform-domain' content='blogspot.com'/>

<!-- data-ad-client=ca-pub-4250488043309056 -->

<link rel="stylesheet" href="https://fonts.googleapis.com/css2?display=swap&family=Cambria"></head><body>*/</style>

<style>/*
<script type="text/javascript" src="https://www.blogger.com/static/v1/widgets/3576124627-widgets.js"></script>
<script type='text/javascript'>
window['__wavt'] = 'AOuZoY7jl9qprvm9iSh_G9HbRLMYjgOmJg:1726794112466';_WidgetManager._Init('//www.blogger.com/rearrange?blogID\x3d8528942724897127701','//kienthucthuongngayedu.blogspot.com/2020/09/giai-tich-12-su-ong-bien-va-nghich-bien.html','8528942724897127701');
_WidgetManager._SetDataContext([{'name': 'blog', 'data': {'blogId': '8528942724897127701', 'title': 'Ki\u1ebfn th\u1ee9c h\u1ecdc t\u1eadp ph\u1ed5 th\xf4ng ', 'url': 'https://kienthucthuongngayedu.blogspot.com/2020/09/giai-tich-12-su-ong-bien-va-nghich-bien.html', 'canonicalUrl': 'https://kienthucthuongngayedu.blogspot.com/2020/09/giai-tich-12-su-ong-bien-va-nghich-bien.html', 'homepageUrl': 'https://kienthucthuongngayedu.blogspot.com/', 'searchUrl': 'https://kienthucthuongngayedu.blogspot.com/search', 'canonicalHomepageUrl': 'https://kienthucthuongngayedu.blogspot.com/', 'blogspotFaviconUrl': 'https://kienthucthuongngayedu.blogspot.com/favicon.ico', 'bloggerUrl': 'https://www.blogger.com', 'hasCustomDomain': false, 'httpsEnabled': true, 'enabledCommentProfileImages': true, 'gPlusViewType': 'FILTERED_POSTMOD', 'adultContent': false, 'analyticsAccountNumber': 'G-2P12Z5QE0W', 'analytics4': true, 'encoding': 'UTF-8', 'locale': 'en', 'localeUnderscoreDelimited': 'en', 'languageDirection': 'ltr', 'isPrivate': false, 'isMobile': false, 'isMobileRequest': false, 'mobileClass': '', 'isPrivateBlog': false, 'isDynamicViewsAvailable': true, 'feedLinks': '\x3clink rel\x3d\x22alternate\x22 type\x3d\x22application/atom+xml\x22 title\x3d\x22Ki\u1ebfn th\u1ee9c h\u1ecdc t\u1eadp ph\u1ed5 th\xf4ng  - Atom\x22 href\x3d\x22https://kienthucthuongngayedu.blogspot.com/feeds/posts/default\x22 /\x3e\n\x3clink rel\x3d\x22alternate\x22 type\x3d\x22application/rss+xml\x22 title\x3d\x22Ki\u1ebfn th\u1ee9c h\u1ecdc t\u1eadp ph\u1ed5 th\xf4ng  - RSS\x22 href\x3d\x22https://kienthucthuongngayedu.blogspot.com/feeds/posts/default?alt\x3drss\x22 /\x3e\n\x3clink rel\x3d\x22service.post\x22 type\x3d\x22application/atom+xml\x22 title\x3d\x22Ki\u1ebfn th\u1ee9c h\u1ecdc t\u1eadp ph\u1ed5 th\xf4ng  - Atom\x22 href\x3d\x22https://www.blogger.com/feeds/8528942724897127701/posts/default\x22 /\x3e\n\n\x3clink rel\x3d\x22alternate\x22 type\x3d\x22application/atom+xml\x22 title\x3d\x22Ki\u1ebfn th\u1ee9c h\u1ecdc t\u1eadp ph\u1ed5 th\xf4ng  - Atom\x22 href\x3d\x22https://kienthucthuongngayedu.blogspot.com/feeds/6828437104081852333/comments/default\x22 /\x3e\n', 'meTag': '', 'adsenseClientId': 'ca-pub-4250488043309056', 'adsenseHostId': 'ca-host-pub-1556223355139109', 'adsenseHasAds': false, 'adsenseAutoAds': false, 'boqCommentIframeForm': true, 'loginRedirectParam': '', 'view': '', 'dynamicViewsCommentsSrc': '//www.blogblog.com/dynamicviews/4224c15c4e7c9321/js/comments.js', 'dynamicViewsScriptSrc': '//www.blogblog.com/dynamicviews/bea942728df245a5', 'plusOneApiSrc': 'https://apis.google.com/js/platform.js', 'disableGComments': true, 'interstitialAccepted': false, 'sharing': {'platforms': [{'name': 'Get link', 'key': 'link', 'shareMessage': 'Get link', 'target': ''}, {'name': 'Facebook', 'key': 'facebook', 'shareMessage': 'Share to Facebook', 'target': 'facebook'}, {'name': 'BlogThis!', 'key': 'blogThis', 'shareMessage': 'BlogThis!', 'target': 'blog'}, {'name': 'Twitter', 'key': 'twitter', 'shareMessage': 'Share to Twitter', 'target': 'twitter'}, {'name': 'Pinterest', 'key': 'pinterest', 'shareMessage': 'Share to Pinterest', 'target': 'pinterest'}, {'name': 'Email', 'key': 'email', 'shareMessage': 'Email', 'target': 'email'}], 'disableGooglePlus': true, 'googlePlusShareButtonWidth': 0, 'googlePlusBootstrap': '\x3cscript type\x3d\x22text/javascript\x22\x3ewindow.___gcfg \x3d {\x27lang\x27: \x27en\x27};\x3c/script\x3e'}, 'hasCustomJumpLinkMessage': false, 'jumpLinkMessage': 'Read more', 'pageType': 'item', 'postId': '6828437104081852333', 'postImageThumbnailUrl': 'https://1.bp.blogspot.com/-dXvEeeEpHQA/X24ZaH8raTI/AAAAAAAAGwI/szs0MZusyeANcse-xgonFo-PR8d4VzhmACPcBGAYYCw/s72-c/giai-tich-12.jpg', 'postImageUrl': 'https://1.bp.blogspot.com/-dXvEeeEpHQA/X24ZaH8raTI/AAAAAAAAGwI/szs0MZusyeANcse-xgonFo-PR8d4VzhmACPcBGAYYCw/s320/giai-tich-12.jpg', 'pageName': 'S\u1ef0 \u0110\u1ed2NG BI\u1ebeN, NGH\u1ecaCH BI\u1ebeN C\u1ee6A H\xc0M S\u1ed0 V\xc0 B\xc0I T\u1eacP FILE WORD - TH\u1ea6Y \u0110\u1eb6NG VI\u1ec6T \u0110\xd4NG', 'pageTitle': 'Ki\u1ebfn th\u1ee9c h\u1ecdc t\u1eadp ph\u1ed5 th\xf4ng : S\u1ef0 \u0110\u1ed2NG BI\u1ebeN, NGH\u1ecaCH BI\u1ebeN C\u1ee6A H\xc0M S\u1ed0 V\xc0 B\xc0I T\u1eacP FILE WORD - TH\u1ea6Y \u0110\u1eb6NG VI\u1ec6T \u0110\xd4NG', 'metaDescription': ' S\u1ef0 \u0110\u1ed2NG BI\u1ebeN V\xc0 NGH\u1ecaCH BI\u1ebeN C\u1ee6A H\xc0M S\u1ed0,  L\xdd THUY\u1ebeT, B\xc0I T\u1eacP C\xd3 \u0110\xc1P \xc1N CHI TI\u1ebeT,  TH\u1ea6Y \u0110\u1eb6NG VI\u1ec6T \u0110\xd4NG'}}, {'name': 'features', 'data': {}}, {'name': 'messages', 'data': {'edit': 'Edit', 'linkCopiedToClipboard': 'Link copied to clipboard!', 'ok': 'Ok', 'postLink': 'Post Link'}}, {'name': 'template', 'data': {'name': 'custom', 'localizedName': 'Custom', 'isResponsive': true, 'isAlternateRendering': false, 'isCustom': true}}, {'name': 'view', 'data': {'classic': {'name': 'classic', 'url': '?view\x3dclassic'}, 'flipcard': {'name': 'flipcard', 'url': '?view\x3dflipcard'}, 'magazine': {'name': 'magazine', 'url': '?view\x3dmagazine'}, 'mosaic': {'name': 'mosaic', 'url': '?view\x3dmosaic'}, 'sidebar': {'name': 'sidebar', 'url': '?view\x3dsidebar'}, 'snapshot': {'name': 'snapshot', 'url': '?view\x3dsnapshot'}, 'timeslide': {'name': 'timeslide', 'url': '?view\x3dtimeslide'}, 'isMobile': false, 'title': 'S\u1ef0 \u0110\u1ed2NG BI\u1ebeN, NGH\u1ecaCH BI\u1ebeN C\u1ee6A H\xc0M S\u1ed0 V\xc0 B\xc0I T\u1eacP FILE WORD - TH\u1ea6Y \u0110\u1eb6NG VI\u1ec6T \u0110\xd4NG', 'description': ' S\u1ef0 \u0110\u1ed2NG BI\u1ebeN V\xc0 NGH\u1ecaCH BI\u1ebeN C\u1ee6A H\xc0M S\u1ed0,  L\xdd THUY\u1ebeT, B\xc0I T\u1eacP C\xd3 \u0110\xc1P \xc1N CHI TI\u1ebeT,  TH\u1ea6Y \u0110\u1eb6NG VI\u1ec6T \u0110\xd4NG', 'featuredImage': 'https://1.bp.blogspot.com/-dXvEeeEpHQA/X24ZaH8raTI/AAAAAAAAGwI/szs0MZusyeANcse-xgonFo-PR8d4VzhmACPcBGAYYCw/s320/giai-tich-12.jpg', 'url': 'https://kienthucthuongngayedu.blogspot.com/2020/09/giai-tich-12-su-ong-bien-va-nghich-bien.html', 'type': 'item', 'isSingleItem': true, 'isMultipleItems': false, 'isError': false, 'isPage': false, 'isPost': true, 'isHomepage': false, 'isArchive': false, 'isLabelSearch': false, 'postId': 6828437104081852333}}, {'name': 'widgets', 'data': [{'title': 'Upload Image', 'type': 'Image', 'sectionId': 'upload-image', 'id': 'Image10'}, {'title': 'Logo', 'type': 'HTML', 'sectionId': 'header-main', 'id': 'HTML10'}, {'title': 'Icons, Dark, Search', 'type': 'LinkList', 'sectionId': 'header-main', 'id': 'LinkList10'}, {'title': 'Menu', 'type': 'LinkList', 'sectionId': 'header-main', 'id': 'LinkList11'}, {'title': '#Popular Weeky', 'type': 'PopularPosts', 'sectionId': 'special-home', 'id': 'PopularPosts11', 'posts': [{'title': 'Tin h\u1ecdc 10 K\u1ebft n\u1ed1i tri th\u1ee9c B\xc0I 19: C\xc2U L\u1ec6NH R\u1ebc NH\xc1NH IF ', 'id': 1549206095398113761}, {'title': 'Unit 10. HEALTHY LIFESTYLE AND LONGEVITY (B\xc0I T\u1eacP TI\u1ebeNG ANH 11 -SGK CH\u01af\u01a0NG TR\xccNH M\u1edaI)', 'id': 3269788830970259082}, {'title': 'Chuy\xean \u0111\u1ec1 To\xe1n 9 \xf4n thi v\xe0o l\u1edbp 10 m\xf4n To\xe1n c\xf3 h\u01b0\u1edbng d\u1eabn gi\u1ea3i chi ti\u1ebft hay nh\u1ea5t', 'id': 6959675125559294098}, {'title': 'T\xe0i li\u1ec7u \xf4n thi tuy\u1ec3n sinh 10 m\xf4n To\xe1n theo chuy\xean \u0111\u1ec1 t\u1ec9nh An Giang', 'id': 830610729910995472}, {'title': 'B\xe0i t\u1eadp tr\u1eafc nghi\u1ec7m hai m\u1eb7t ph\u1eb3ng song song - Th\u1ea7y \u0110\u1eb7ng Vi\u1ec7t \u0110\xf4ng (File Word)', 'id': 5014468676362501030}, {'title': 'T\u1eea V\u1ef0NG NG\u1eee PH\xc1P TI\u1ebeNG ANH THI TUY\u1ec2N SINH 10 ', 'id': 6700631332795623551}, {'title': 'Tin h\u1ecdc 10 K\u1ebft n\u1ed1i tri th\u1ee9c  B\xe0i 1. Th\xf4ng tin v\xe0 x\u1eed l\xed th\xf4ng tin k\u1ebft n\u1ed1i tri th\u1ee9c', 'id': 8840962043264592790}]}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'special-home', 'id': 'HTML25'}, {'title': '#CustomPost by Label', 'type': 'HTML', 'sectionId': 'special-home', 'id': 'HTML26'}, {'title': 'Featured Post', 'type': 'FeaturedPost', 'sectionId': 'before-blog', 'id': 'FeaturedPost1', 'postId': '4990869279470991352'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'before-post', 'id': 'HTML12'}, {'title': 'Blog Posts', 'type': 'Blog', 'sectionId': 'blog-post', 'id': 'Blog1', 'posts': [{'id': '6828437104081852333', 'title': 'S\u1ef0 \u0110\u1ed2NG BI\u1ebeN, NGH\u1ecaCH BI\u1ebeN C\u1ee6A H\xc0M S\u1ed0 V\xc0 B\xc0I T\u1eacP FILE WORD - TH\u1ea6Y \u0110\u1eb6NG VI\u1ec6T \u0110\xd4NG', 'featuredImage': 'https://1.bp.blogspot.com/-dXvEeeEpHQA/X24ZaH8raTI/AAAAAAAAGwI/szs0MZusyeANcse-xgonFo-PR8d4VzhmACPcBGAYYCw/s320/giai-tich-12.jpg', 'showInlineAds': false}], 'footerBylines': [{'regionName': 'footer1', 'items': [{'name': 'author', 'label': 'by'}, {'name': 'timestamp', 'label': 'MMM d, yyyy'}, {'name': 'comments', 'label': 'Comment'}, {'name': 'icons', 'label': ''}, {'name': 'share', 'label': ''}]}, {'regionName': 'footer2', 'items': [{'name': 'labels', 'label': 'Tags:'}]}], 'allBylineItems': [{'name': 'author', 'label': 'by'}, {'name': 'timestamp', 'label': 'MMM d, yyyy'}, {'name': 'comments', 'label': 'Comment'}, {'name': 'icons', 'label': ''}, {'name': 'share', 'label': ''}, {'name': 'labels', 'label': 'Tags:'}]}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML13'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML14'}, {'title': '#You may also like', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML15'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML16'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'ads-post', 'id': 'HTML17'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'after-blog', 'id': 'HTML18'}, {'title': 'Popular Posts', 'type': 'PopularPosts', 'sectionId': 'sidebar-static', 'id': 'PopularPosts10', 'posts': [{'title': 'Chuy\xean \u0111\u1ec1 To\xe1n 9 \xf4n thi v\xe0o l\u1edbp 10 m\xf4n To\xe1n c\xf3 h\u01b0\u1edbng d\u1eabn gi\u1ea3i chi ti\u1ebft hay nh\u1ea5t', 'id': 6959675125559294098}, {'title': 'Tin h\u1ecdc 10 K\u1ebft n\u1ed1i tri th\u1ee9c B\xc0I 19: C\xc2U L\u1ec6NH R\u1ebc NH\xc1NH IF ', 'id': 1549206095398113761}, {'title': 'L\xfd thuy\u1ebft v\xe0 tr\u1eafc nghi\u1ec7m Tin h\u1ecdc l\u1edbp 6 B\xe0i 1: Th\xf4ng tin - thu nh\u1eadn v\xe0 x\u1eed l\xed th\xf4ng tin - C\xe1nh di\u1ec1u', 'id': 2300582157222820321}, {'title': 'L\xfd thuy\u1ebft Tin 10 K\u1ebft n\u1ed1i tri th\u1ee9c B\xe0i 24: X\xe2u k\xed t\u1ef1', 'id': 5853627850564990024}, {'title': 'Unit 10. HEALTHY LIFESTYLE AND LONGEVITY (B\xc0I T\u1eacP TI\u1ebeNG ANH 11 -SGK CH\u01af\u01a0NG TR\xccNH M\u1edaI)', 'id': 3269788830970259082}]}, {'title': 'Categories', 'type': 'Label', 'sectionId': 'sidebar-static', 'id': 'Label10'}, {'title': '#Recent Post', 'type': 'HTML', 'sectionId': 'sidebar-static', 'id': 'HTML19'}, {'title': '#Advertisement', 'type': 'HTML', 'sectionId': 'sidebar-sticky', 'id': 'HTML20'}, {'title': 'About Us', 'type': 'HTML', 'sectionId': 'footer-widget', 'id': 'HTML21'}, {'title': 'Learn More', 'type': 'LinkList', 'sectionId': 'footer-widget', 'id': 'LinkList13'}, {'title': 'Follow Us Youtube, Facebook', 'type': 'LinkList', 'sectionId': 'footer-widget', 'id': 'LinkList14'}, {'title': 'Newsletter', 'type': 'HTML', 'sectionId': 'footer-widget', 'id': 'HTML22'}, {'title': 'Copyright', 'type': 'HTML', 'sectionId': 'copyright', 'id': 'HTML23'}, {'title': 'SVG Icons', 'type': 'HTML', 'sectionId': 'jet-options', 'id': 'HTML27'}, {'title': 'License Key', 'type': 'HTML', 'sectionId': 'jet-options', 'id': 'HTML28'}]}]);
_WidgetManager._RegisterWidget('_ImageView', new _WidgetInfo('Image10', 'upload-image', document.getElementById('Image10'), {'resize': false}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML10', 'header-main', document.getElementById('HTML10'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList10', 'header-main', document.getElementById('LinkList10'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList11', 'header-main', document.getElementById('LinkList11'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_PopularPostsView', new _WidgetInfo('PopularPosts11', 'special-home', document.getElementById('PopularPosts11'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML25', 'special-home', document.getElementById('HTML25'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML26', 'special-home', document.getElementById('HTML26'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_FeaturedPostView', new _WidgetInfo('FeaturedPost1', 'before-blog', document.getElementById('FeaturedPost1'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML12', 'before-post', document.getElementById('HTML12'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_BlogView', new _WidgetInfo('Blog1', 'blog-post', document.getElementById('Blog1'), {'cmtInteractionsEnabled': false, 'lightboxEnabled': true, 'lightboxModuleUrl': 'https://www.blogger.com/static/v1/jsbin/128363787-lbx.js', 'lightboxCssUrl': 'https://www.blogger.com/static/v1/v-css/13464135-lightbox_bundle.css'}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML13', 'ads-post', document.getElementById('HTML13'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML14', 'ads-post', document.getElementById('HTML14'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML15', 'ads-post', document.getElementById('HTML15'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML16', 'ads-post', document.getElementById('HTML16'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML17', 'ads-post', document.getElementById('HTML17'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML18', 'after-blog', document.getElementById('HTML18'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_PopularPostsView', new _WidgetInfo('PopularPosts10', 'sidebar-static', document.getElementById('PopularPosts10'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LabelView', new _WidgetInfo('Label10', 'sidebar-static', document.getElementById('Label10'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML19', 'sidebar-static', document.getElementById('HTML19'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML20', 'sidebar-sticky', document.getElementById('HTML20'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML21', 'footer-widget', document.getElementById('HTML21'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList13', 'footer-widget', document.getElementById('LinkList13'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_LinkListView', new _WidgetInfo('LinkList14', 'footer-widget', document.getElementById('LinkList14'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML22', 'footer-widget', document.getElementById('HTML22'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML23', 'copyright', document.getElementById('HTML23'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML27', 'jet-options', document.getElementById('HTML27'), {}, 'displayModeFull'));
_WidgetManager._RegisterWidget('_HTMLView', new _WidgetInfo('HTML28', 'jet-options', document.getElementById('HTML28'), {}, 'displayModeFull'));
</script>
</body>*/</style>

Popular Posts

Chuyên đề Toán 9 ôn thi vào lớp 10 môn Toán có hướng dẫn giải chi tiết hay nhất

Tin học 10 Kết nối tri thức BÀI 19: CÂU LỆNH RẼ NHÁNH IF

Lý thuyết và trắc nghiệm Tin học lớp 6 Bài 1: Thông tin - thu nhận và xử lí thông tin - Cánh diều

Lý thuyết Tin 10 Kết nối tri thức Bài 24: Xâu kí tự

Unit 10. HEALTHY LIFESTYLE AND LONGEVITY (BÀI TẬP TIẾNG ANH 11 -SGK CHƯƠNG TRÌNH MỚI)

Categories