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{"id":27334,"date":"2018-04-17T12:58:46","date_gmt":"2018-04-17T05:58:46","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=27334"},"modified":"2018-04-17T12:58:46","modified_gmt":"2018-04-17T05:58:46","slug":"chuong-2-bai-tap-trac-nghiem-giai-tich-12-bat-phuong-trinh-mu-va-bat-phuong-trinh-logarit-phan-2","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/chuong-2-bai-tap-trac-nghiem-giai-tich-12-bat-phuong-trinh-mu-va-bat-phuong-trinh-logarit-phan-2\/","title":{"rendered":"Ch\u01b0\u01a1ng 2 -B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m Gi\u1ea3i t\u00edch 12: B\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh m\u0169 v\u00e0 b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh l\u00f4garit (Ph\u1ea7n 2)"},"content":{"rendered":"

C\u00e2u 6:<\/b>\u00a0T\u00ecm t\u1eadp nghi\u1ec7m c\u1ee7a b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh log(x – 21) < 2 – logx<\/p>\n

A. (-4; 25) \u00a0\u00a0\u00a0 B. (0; 25) \u00a0\u00a0\u00a0C. (21; 25) \u00a0\u00a0\u00a0D. (25; +\u221e)<\/p>\n

C\u00e2u 7:<\/b>\u00a0T\u00ecm mi\u1ec1n x\u00e1c \u0111\u1ecbnh c\u1ee7a h\u00e0m s\u1ed1<\/p>\n

\"\"<\/p>\n

C\u00e2u 8:<\/b>\u00a0T\u00ecm c\u00e1c kho\u1ea3ng \u0111\u1ed3ng bi\u1ebfn c\u1ee7a h\u00e0m s\u1ed1 y = x2<\/sup>lnx<\/p>\n

\"\"<\/p>\n

C\u00e2u 9:<\/b>\u00a0M\u1ed9t t\u00e0u v\u0169 tr\u1ee5 \u0111\u01b0\u1ee3c cung c\u1ea5p b\u1edfi m\u1ed9t ngu\u1ed3n \u0111i\u1ec7n \u0111\u1ed3ng v\u1ecb ph\u00f3ng x\u1ea1 plutoni-238. C\u00f4ng su\u1ea5t \u0111\u1ea7u ra c\u1ee7a ngu\u1ed3n \u0111i\u1ec7n n\u00e0y \u0111\u01b0\u1ee3c \u01b0\u1edbc l\u01b0\u1ee3ng b\u1edfi<\/p>\n

\"\"<\/p>\n

trong \u0111\u00f3 t l\u00e0 s\u1ed1 n\u0103m k\u1ec3 t\u1eeb khi con t\u00e0u ho\u1ea1t \u0111\u1ed9ng. Bi\u1ebft r\u1eb1ng \u0111\u1ec3 c\u00e1c thi\u1ebft b\u1ecb tr\u00ean t\u00e0u ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng, ngu\u1ed3n c\u1ea7n cung c\u1ea5p c\u00f4ng su\u1ea5t t\u1ed1i thi\u1ec3u l\u00e0 600W. H\u1ecfi con t\u00e0u \u0111\u1ee7 \u0111i\u1ec7n \u0111\u1ec3 c\u00e1c thi\u1ebft b\u1ecb ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng trong th\u1eddi gian bao l\u00e2u ?<\/p>\n

A. 45 n\u0103m \u00a0\u00a0\u00a0B. 47 n\u0103m\u00a0\u00a0\u00a0C. 48 n\u0103m\u00a0\u00a0\u00a0D. 50 n\u0103m<\/p>\n

C\u00e2u 10:<\/b>\u00a0D\u00e2n s\u1ed1 Vi\u1ec7t Nam n\u0103m 2015 l\u00e0 91,71 tri\u1ec7u ng\u01b0\u1eddi. Gi\u1ea3 s\u1eed trong 5 n\u0103m t\u1ec9 l\u1ec7 t\u0103ng d\u00e2n s\u1ed1 l\u00e0 kh\u00f4ng \u0111\u1ed5i. H\u1ecfi t\u1ec9 l\u1ec7 n\u00e0y c\u00f3 th\u1ec3 nh\u1eadn gi\u00e1 tr\u1ecb t\u1ed1i \u0111a l\u00e0 bao nhi\u00eau \u0111\u1ec3 d\u00e2n s\u1ed1 Vi\u1ec7t Nam n\u0103m 2020 kh\u00f4ng v\u01b0\u1ee3t qu\u00e1 96,5 tri\u1ec7u ng\u01b0\u1eddi (l\u00e0m tr\u00f2n k\u1ebft qu\u1ea3 \u0111\u1ebfn ph\u1ea7n ch\u1ee5c ngh\u00ecn) ?<\/p>\n

A. 1,08% \u00a0\u00a0\u00a0B. 0,91%\u00a0\u00a0\u00a0C. 1,06%\u00a0\u00a0\u00a0D. 1,02%<\/p>\n

H\u01b0\u1edbng d\u1eabn gi\u1ea3i v\u00e0 \u0110\u00e1p \u00e1n<\/b><\/p>\n\n\n\n
6-C<\/td>\n7-A<\/td>\n8-C<\/td>\n9-B<\/td>\n10-D<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

C\u00e2u 6:<\/b><\/p>\n

\u0110i\u1ec1u ki\u1ec7n x > 21 . Khi \u0111\u00f3 log(x – 21) < 2 – logx<\/p>\n

<=> log[x(x – 21)] < 2 <=> x(x – 21) < 100 <=> x2<\/sup>\u00a0– 21x – 100 < 0<\/p>\n

<=> -4 < x < 25 <=> 21 < x < 25 (do x > 21)<\/p>\n

Ch\u1ecdn \u0111\u00e1p \u00e1n C.<\/p>\n

Nh\u1eadn x\u00e9t. Nhi\u1ec1u b\u00e0i to\u00e1n quen thu\u1ed9c nh\u01b0 t\u00ecm mi\u1ec1n x\u00e1c \u0111\u1ecbnh c\u1ee7a h\u00e0m s\u1ed1, x\u00e9t t\u00ednh \u0111\u01a1n \u0111i\u1ec7u, c\u1ef1c tr\u1ecb,\u2026 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c ph\u1ea3i gi\u1ea3i c\u00e1c b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh m\u0169, l\u00f4garit. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 v\u00ed d\u1ee5.<\/p>\n

C\u00e2u 7:<\/b><\/p>\n

H\u00e0m s\u1ed1 x\u00e1c \u0111\u1ecbnh khi<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn \u0111\u00e1p \u00e1n A.<\/p>\n

C\u00e2u 8:<\/b><\/p>\n

T\u1eadp x\u00e1c \u0111\u1ecbnh: D = (0; +\u221e)<\/p>\n

y’ = 2xlnx + x2<\/sup>.1\/x = x(2lns + 1).<\/p>\n

Ta th\u1ea5y:<\/p>\n

y’ > 0 <=> 2lnx + 1 > 0 (do x > 0)<\/p>\n

\"\"<\/p>\n

T\u1eeb \u0111\u00f3 kho\u1ea3ng \u0111\u1ed3ng bi\u1ebfn c\u1ee7a h\u00e0m s\u1ed1 l\u00e0<\/p>\n

\"\"<\/p>\n

Ch\u1ecdn \u0111\u00e1p \u00e1n C.<\/p>\n

C\u00e2u 9:<\/b><\/p>\n

Con t\u00e0u ho\u1ea1t \u0111\u1ed9ng b\u00ecnh th\u01b0\u1eddng khi<\/p>\n

\"B\u00e0i\"\"<\/p>\n

Ch\u1ecdn \u0111\u00e1p \u00e1n B<\/p>\n

C\u00e2u 10:<\/b><\/p>\n

Gi\u1ea3 s\u1eed t\u1ec9 l\u1ec7 t\u0103ng d\u00e2n s\u1ed1 trong 5 n\u0103m \u0111\u00f3 t\u1eeb 2015 \u0111\u1ebfn 2020 l\u00e0 k kh\u00f4ng \u0111\u1ed5i. \u0110i\u1ec1u ki\u1ec7n c\u1ee7a \u0111\u1ea7u b\u00e0i l\u00e0 :<\/p>\n

91,71.e5k<\/sup>\u00a0\u2264 96,5<\/p>\n

\"\"<\/p>\n

V\u1eady t\u1ec9 l\u1ec7 t\u0103ng d\u00e2n s\u1ed1 t\u1ed1i \u0111a l\u00e0 1,02%.<\/p>\n

Ch\u1ecdn \u0111\u00e1p \u00e1n D.<\/p>\n","protected":false},"excerpt":{"rendered":"

C\u00e2u 6:\u00a0T\u00ecm t\u1eadp nghi\u1ec7m c\u1ee7a b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh log(x – 21) < 2 – logx A. (-4; 25) \u00a0\u00a0\u00a0 B. (0; 25) \u00a0\u00a0\u00a0C. (21; 25) \u00a0\u00a0\u00a0D. (25; +\u221e) C\u00e2u 7:\u00a0T\u00ecm mi\u1ec1n x\u00e1c \u0111\u1ecbnh c\u1ee7a h\u00e0m s\u1ed1 C\u00e2u 8:\u00a0T\u00ecm c\u00e1c kho\u1ea3ng \u0111\u1ed3ng bi\u1ebfn c\u1ee7a h\u00e0m s\u1ed1 y = x2lnx C\u00e2u 9:\u00a0M\u1ed9t t\u00e0u v\u0169 tr\u1ee5 \u0111\u01b0\u1ee3c cung […]<\/p>\n","protected":false},"author":3,"featured_media":27335,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[157],"tags":[1447,1446],"yoast_head":"\nCh\u01b0\u01a1ng 2 -B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m Gi\u1ea3i t\u00edch 12: B\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh m\u0169 v\u00e0 b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh l\u00f4garit (Ph\u1ea7n 2)<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/chuong-2-bai-tap-trac-nghiem-giai-tich-12-bat-phuong-trinh-mu-va-bat-phuong-trinh-logarit-phan-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ch\u01b0\u01a1ng 2 -B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m Gi\u1ea3i t\u00edch 12: B\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh m\u0169 v\u00e0 b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh l\u00f4garit (Ph\u1ea7n 2)\" \/>\n<meta property=\"og:description\" content=\"C\u00e2u 6:\u00a0T\u00ecm t\u1eadp nghi\u1ec7m c\u1ee7a b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh log(x – 21) < 2 – logx A. (-4; 25) \u00a0\u00a0\u00a0 B. (0; 25) \u00a0\u00a0\u00a0C. (21; 25) \u00a0\u00a0\u00a0D. (25; +\u221e) C\u00e2u 7:\u00a0T\u00ecm mi\u1ec1n x\u00e1c \u0111\u1ecbnh c\u1ee7a h\u00e0m s\u1ed1 C\u00e2u 8:\u00a0T\u00ecm c\u00e1c kho\u1ea3ng \u0111\u1ed3ng bi\u1ebfn c\u1ee7a h\u00e0m s\u1ed1 y = x2lnx C\u00e2u 9:\u00a0M\u1ed9t t\u00e0u v\u0169 tr\u1ee5 \u0111\u01b0\u1ee3c cung […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/chuong-2-bai-tap-trac-nghiem-giai-tich-12-bat-phuong-trinh-mu-va-bat-phuong-trinh-logarit-phan-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam\" \/>\n<meta property=\"article:published_time\" content=\"2018-04-17T05:58:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/04\/1-226.png\" \/>\n\t<meta property=\"og:image:width\" content=\"317\" \/>\n\t<meta property=\"og:image:height\" content=\"165\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"H\u00e0 Trang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"H\u00e0 Trang\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/lop12.edu.vn\/chuong-2-bai-tap-trac-nghiem-giai-tich-12-bat-phuong-trinh-mu-va-bat-phuong-trinh-logarit-phan-2\/\",\"url\":\"https:\/\/lop12.edu.vn\/chuong-2-bai-tap-trac-nghiem-giai-tich-12-bat-phuong-trinh-mu-va-bat-phuong-trinh-logarit-phan-2\/\",\"name\":\"Ch\u01b0\u01a1ng 2 -B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m Gi\u1ea3i t\u00edch 12: B\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh m\u0169 v\u00e0 b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh l\u00f4garit (Ph\u1ea7n 2)\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-04-17T05:58:46+00:00\",\"dateModified\":\"2018-04-17T05:58:46+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/chuong-2-bai-tap-trac-nghiem-giai-tich-12-bat-phuong-trinh-mu-va-bat-phuong-trinh-logarit-phan-2\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/chuong-2-bai-tap-trac-nghiem-giai-tich-12-bat-phuong-trinh-mu-va-bat-phuong-trinh-logarit-phan-2\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/chuong-2-bai-tap-trac-nghiem-giai-tich-12-bat-phuong-trinh-mu-va-bat-phuong-trinh-logarit-phan-2\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Ch\u01b0\u01a1ng 2 -B\u00e0i t\u1eadp tr\u1eafc nghi\u1ec7m Gi\u1ea3i t\u00edch 12: B\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh m\u0169 v\u00e0 b\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh l\u00f4garit (Ph\u1ea7n 2)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lop12.edu.vn\/#website\",\"url\":\"https:\/\/lop12.edu.vn\/\",\"name\":\"Lop12.edu.vn - 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