记Y1=X1X4,Y2=X2X3,则X=Y1-Y2,且Y1,Y2独立同分布: P{Y1=1}=P{X1=1,X4=1}=P{X1=1}P{X4=1}=0.16=P{Y2

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答案记Y1=X1X4,Y2=X2X3,则X=Y1-Y2,且Y1,Y2独立同分布: P{Y1=1}=P{X1=1,X4=1}=P{X1=1}P{X4=1}=0.16=P{Y2<

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