4、曲线 https:/img.zuoyebang.cc/zyb_c011ae167cb571e3b691355621d443db.jpg'=(x)^3-4(x)^2+3x+4 的凹区间是 () .-|||-(A) [ dfrac (4)(3),+x) (B) (-x,dfrac (1)(3)] -|||-(C) [ -2,0] : (D)没有凹区间。

平面https:/img.zuoyebang.cc/zyb_443e7b4f4bf9228e9f1fec85132a95c9.jpg:2x+3y+4z+1=0

[题目]-|||-分组分解因式:-|||-(1) 3x-4y+xy-12 .-|||-(2) (x)^3+x+a+1 .-|||-(3) https:/img.

. https:/img.zuoyebang.cc/zyb_59b3de1062e243c0b1e32e8058920d73.jpg+({x)_(n)}^2

直线https:/img.zuoyebang.cc/zyb_3b22ae73d69b101d1bae06f562ca4bd9.jpg:dfrac (x+2)(3

设矩阵A= (3,-2) ,B= 2 4 https:/img.zuoyebang.cc/zyb_7142fe6d884b795b75323081826723e

6.总体X的概率分布为-|||-x 0 1 2 3-|||-P θ^2 (1-0) θ^2 https:/img.zuoyebang.cc/zyb_d23f4d

(13)(2010年,一)设总体X的分布为:-|||-X 1 2 3-|||-p https:/img.zuoyebang.cc/zyb_2a76612f050

【 https:/img.zuoyebang.cc/zyb_a2c4b8a86ffc9c17b4192162142e659f.jpg-3 .已知一质点的运动方程

*(CO)=0.678 . https:/img.zuoyebang.cc/zyb_d7bd9e4c4e6bf8bf7c5501cba60ee7e8.jpg(x

[题目]-|||-计算 https:/img.zuoyebang.cc/zyb_52d4b2f30ca827810621e201c6d77cd7.jpg=iin