• 2021-04-14
    已知,则f(-xy,x/y)=/ananas/latex/p/964021
  • https://mooc1-1.chaoxing.com/ananas/latex/p/964061

    内容

    • 0

      F(x,y)是二维随机变量(X,Y)的分布函数,则=/ananas/latex/p/572877

    • 1

      图中,F=5kN且过A点垂直于xy平面。该力对x轴和y轴的矩分别为:=_ __________ _; = __________ _。/ananas/latex/p/665689/ananas/latex/p/6656909b94a196c72fb15e887eace63dc377a1.png

    • 2

      设X~N(μ,4),Y~N(μ,9),a=P{Xμ-2},b=P{Yμ+3},则/ananas/latex/p/1237/ananas/latex/p/990

    • 3

      已知随机向量(X,Y)的联合分布密度;则E(Y)=()/ananas/latex/p/546439

    • 4

      设L是圆周x=acost, y=asint (),则/ananas/latex/p/21409/ananas/latex/p/2330162