概率论与数理统计,请问这题怎么写?
1个回答
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=1-p(x+y<1)
而p(x+y<1)=
∫(0,1)dy ∫(0,1-y) x²+xy/3 dx
=∫(0,1) x³/3+x²y/6|(0, 1-y) dy
=∫(0,1) (1-y)³/3+y(1-y)²/6
=-(1-y)⁴/12|(0,1)+1/24y⁴-1/9y³+1/12y²|(0,1)
=1/12+1/24-1/9+1/12
=5/24-1/9
=7/72
而p(x+y<1)=
∫(0,1)dy ∫(0,1-y) x²+xy/3 dx
=∫(0,1) x³/3+x²y/6|(0, 1-y) dy
=∫(0,1) (1-y)³/3+y(1-y)²/6
=-(1-y)⁴/12|(0,1)+1/24y⁴-1/9y³+1/12y²|(0,1)
=1/12+1/24-1/9+1/12
=5/24-1/9
=7/72
更多追问追答
追答
还没完,所以原题=1-7/72=65/72
追问
哥,为什么是0-1积分dy,能不能是0-1dx 0-1减x dy?
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