概率论这题的第三问怎么求
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就是计算P(U<u)=P(x<u且y<u)
①u<0 P(U<u)=0
②0<u<1 P(U<u)=P(x<u且y<u)=∫[0到u]dx∫[0到u] bexp(-x-y)dy
=b∫[0到u] exp(-x)dx ∫[0到u] exp(-y)dy
=b(1-exp(-u))²
③u>1
P(U<u)=P(x<u且y<u)=∫[0到1] dx∫[0到u] bexp(-x-y)dy
=b∫[0到1] exp(-x)dx ∫[0到u] exp(-y)dy
=b(1-exp(-1))(1-exp(-u))
①u<0 P(U<u)=0
②0<u<1 P(U<u)=P(x<u且y<u)=∫[0到u]dx∫[0到u] bexp(-x-y)dy
=b∫[0到u] exp(-x)dx ∫[0到u] exp(-y)dy
=b(1-exp(-u))²
③u>1
P(U<u)=P(x<u且y<u)=∫[0到1] dx∫[0到u] bexp(-x-y)dy
=b∫[0到1] exp(-x)dx ∫[0到u] exp(-y)dy
=b(1-exp(-1))(1-exp(-u))
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