Tính đơn điệu và cực trị của hàm số

Home Lớp 12 Toán lớp 12 - Sách Kết nối tri thức Bài 1. Tính đơn điệu và cực trị của hàm số.Bài tập trung bình

{"common":{"save":0,"post_id":"7383","level":2,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5273","post_id":"7383","mon_id":"1159285","chapter_id":"1159288","question":"Cho hàm s\u1ed1 $y=x^3-2x^2+x+1$<\/span>. M\u1ec7nh \u0111\u1ec1 nào d\u01b0\u1edbi \u0111ây \u0111úng<\/strong>?<\/p>","options":["A.<\/strong> Hàm s\u1ed1 ngh\u1ecbch bi\u1ebfn trên kho\u1ea3ng $\\bigg(\\dfrac{1}{3};1\\bigg)$<\/span>","B.<\/strong> Hàm s\u1ed1 ngh\u1ecbch bi\u1ebfn trên kho\u1ea3ng $\\bigg(-\\infty;\\dfrac{1}{3}\\bigg)$<\/span>","C.<\/strong> Hàm s\u1ed1 \u0111\u1ed3ng bi\u1ebfn trên kho\u1ea3ng $\\bigg(\\dfrac{1}{3};1\\bigg)$<\/span>","D.<\/strong> Hàm s\u1ed1 ngh\u1ecbch bi\u1ebfn trên kho\u1ea3ng $(1;+\\infty)$<\/span>"],"correct":"1","level":"2","hint":"Tìm TX\u0110; tính y' và l\u1eadp b\u1ea3ng bi\u1ebfn thiên.<\/p>","answer":"Ch\u1ecdn A.<\/strong> Hàm s\u1ed1 ngh\u1ecbch bi\u1ebfn trên kho\u1ea3ng $\\bigg(\\dfrac{1}{3};1\\bigg)$<\/span><\/span><\/p>Ta có: y' = 3x² – 4x + 1 ⇒ y' = 0 ⇔ x = 1 ho\u1eb7c x = $\\dfrac{1}{3}$<\/span>.<\/p>B\u1ea3ng bi\u1ebfn thiên:<\/p><svg height=\"140\" width=\"500\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"142\" 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\" y=\"2\"><\/image> <\/g> <\/svg><\/span><\/p>V\u1eady hàm s\u1ed1 ngh\u1ecbch bi\u1ebfn trên kho\u1ea3ng $\\bigg(\\dfrac{1}{3};1\\bigg)$<\/span>.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-06-13 02:32:50","option_type":"math","len":0},{"id":"5276","post_id":"7383","mon_id":"1159285","chapter_id":"1159288","question":"Cho hàm s\u1ed1 $y=\\dfrac{x-2}{x+1}$<\/span>. M\u1ec7nh \u0111\u1ec1 nào d\u01b0\u1edbi \u0111ây \u0111úng<\/strong>?<\/p>","options":["A.<\/strong> Hàm s\u1ed1 ngh\u1ecbch bi\u1ebfn trên $(-\\infty;-1)$<\/span>","B.<\/strong> Hàm s\u1ed1 \u0111\u1ed3ng bi\u1ebfn trên $(-\\infty;-1)$<\/span>","C.<\/strong> Hàm s\u1ed1 \u0111\u1ed3ng bi\u1ebfn trên $(-\\infty;+\\infty)$<\/span>","D.<\/strong> Hàm s\u1ed1 ngh\u1ecbch bi\u1ebfn trên $(-1;+\\infty)$<\/span>"],"correct":"2","level":"2","hint":"Tìm TX\u0110, tính y' và l\u1eadp b\u1ea3ng bi\u1ebfn thiên.<\/p>","answer":"Ch\u1ecdn B.<\/strong> Hàm s\u1ed1 \u0111\u1ed3ng bi\u1ebfn trên $(-\\infty;-1)$<\/span><\/span><\/p>$y=\\dfrac{x-2}{x+1}$<\/span> ⇒ $y^\\prime=\\dfrac{3}{(x+1)^2} >0,\\forall x\\ne -1$<\/span>.<\/p>Hàm s\u1ed1 \u0111\u1ed3ng bi\u1ebfn trên các kho\u1ea3ng $(-\\infty;-1)$<\/span> và $(-1;+\\infty)$<\/span>.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-06-13 02:38:10","option_type":"math","len":0},{"id":"5277","post_id":"7383","mon_id":"1159285","chapter_id":"1159288","question":"Hàm s\u1ed1 nào sau \u0111ây \u0111\u1ed3ng bi\u1ebfn trên R?<\/p>","options":["A.<\/strong> $y=x^4-x^2$<\/span>","B.<\/strong> $y=x^3+x$<\/span>","C.<\/strong> $y=\\dfrac{x-1}{x+2}$<\/span>","D.<\/strong> $y=x^3-x$<\/span>"],"correct":"2","level":"2","hint":"Tìm TX\u0110; tính y' và l\u1eadp b\u1ea3ng bi\u1ebfn thiên.<\/p>","answer":"Ch\u1ecdn B.<\/strong> $y=x^3+x$<\/span><\/span><\/p>Ta th\u1ea5y ch\u1ec9 có hàm s\u1ed1 $y=x^3+x$<\/span> có $y^\\prime=3x^2+1> 0 ,\\forall x \\in \\mathbb R$<\/span>.<\/p>V\u1eady hàm s\u1ed1 $y=x^3+x$<\/span> \u0111\u1ed3ng bi\u1ebfn trên R.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-06-13 02:41:45","option_type":"math","len":0}]}