若向量[img=27x29]1803bbf0a3a1732.png[/img],且向量[img=115x29]1803bbf0ab97983.png[/img],[img=35x24]1803bbf0b543bb7.png[/img]= - 18,则[img=29x19]1803bbf0bd455ca.png[/img]( )
A: (4,-2,-4)
B: (-4,-2,-4)
C: (-4,2,4)
D: (4,-2,4)
A: (4,-2,-4)
B: (-4,-2,-4)
C: (-4,2,4)
D: (4,-2,4)
C
举一反三
- 若向量[img=27x29]1803bbf1e1cd681.png[/img],且向量[img=115x29]1803bbf1e945ae2.png[/img],[img=35x24]1803bbf1f13de8a.png[/img]= - 18,则[img=29x19]1803bbf1fc71fcd.png[/img]( ) A: (4,-2,-4) B: (-4,-2,-4) C: (-4,2,4) D: (4,-2,4)
- 求不定积分[img=121x54]17da653839aa6ae.png[/img]; ( ) A: log(x^2 + 3*x + 25/4)/4 + (5*atan(x/2 + 3/4))/4 B: log(x^2 + 3*x + 25/4)/4 C: (5*atan(x/2 + 3/4))/4 D: log(x^2 + 3*x + 25/4)/4 - (5*atan(x/2 + 3/4))/4
- 设[img=84x22]17e0ab7201ab5da.jpg[/img],且P{2<;X<;4}=0.1,不查表计算P{X<;0}=( ) A: 1/5 B: 2/5 C: 3/5 D: 4/5
- 设[img=84x22]17e43a3ff587368.jpg[/img],且P{2<;X<;4}=0.1,不查表计算P{X<;0}=( ) A: 1/5 B: 2/5 C: 3/5 D: 4/5
- 矩阵[img=117x63]18034e621c98abd.png[/img]的三个特征值是( ). A: 1, 4, 0 B: 2, 3 , 0 C: 2, 4, 0 D: 2, 4, -1
内容
- 0
求不定积分[img=112x35]17da6538063a9e4.png[/img]; ( ) A: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/ B: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4))/8 C: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4)) D: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/8
- 1
4. 方程[img=91x71]18039d1f1e873db.png[/img]=0的解为 A: x=1或x=2 B: x=0或x=2 C: x=0或x=1 D: x=0或x=4
- 2
设线性规划的约束条件为[img=12x21]17da6d37c7a302d.png[/img][img=129x75]17da6d37d4b8cf4.png[/img] 则基本可行解为( ) A: (0, 0, 4, 3) B: (3, 0, 4, 0) C: (3, 4, 0, 0) D: (2, 0, 1, 0)
- 3
下列關於函數[img=9x23]17de5fbd984e1e1.png[/img]何者正確? 如果[img=170x27]17de67a4253f96d.png[/img], [img=87x21]17de67a43152acf.png[/img].0≤x≤2π0≤x≤2π A: Inflection point (π/3 , 5/4) B: - C: - D: -
- 4
设随机变量X的概率密度为[img=255x100]1802f2babb85d66.png[/img]则E(X) = ( ). A: 0 B: 4 C: 2 D: 不存在