前两问我和答案做的是一样的,第三问求F(u)我是这样做的F(u)=P{U<=u}=P{YZ<=u}=P{YZ<=u|Y=0}P{Y=0}+P{YZ<=u|Y=1}P{Y=1}=P{0<=u|Y=0}P{Y=0}+P{Z<=u|Y=1}P{Y=1}=P{0<=u}P{Y=0}+P{Z<=u}P{Y=1}然后就是当 u<0时,F(u
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