设二维随机变量（X,Y)概率密度为f(x,y)=3x,{0
<p>问题：设二维随机变量（X,Y)概率密度为f(x,y)=3x,{0<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">陆家运的回答：<div class="content-b">网友采纳 把x=1/4代入f(x,y)=3x,{0<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">齐怀琴的回答：<div class="content-b">网友采纳 错<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">陆家运的回答：<div class="content-b">网友采纳 f(y)=3/2*(1-y^2),0
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