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P{X=1}=P{恰有一个继电器接通} =P(A4)+P(AA) =P(A)P(A)+P(A)P(A) =0.8×0.2+0.2×0.8=0.32 P{X=2}=P{两个继电器都接通} =P(A4) =P(A)P(A) =0.8×0.8 =0.64. @@的 0.8 0.2 0.2 0.8 0.32 , ( ) ( ) ( ) ( ) ( ) ( ) 1 2 1 2 1 2 1 2 =  +  = = + = + P A P A P A P A P A A P A A P{X=1}=P{恰有一个继电器接通} 0.64 . 0.8 0.8 ( ) ( ) ( ) 1 2 1 2 = =  = = P A P A P A A P{X=2}= P{两个继电器都接通}
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