• 2022-06-18
    ‏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)
  • C

    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