已知(x+3)²+|x-y+10|=0,求5x²y-[2x²y-(3xy-xy²
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已知(x+3)²+|x-y+10|=0,求5x²y-[2x²y-(3xy-xy²)-3x]-2xy²-y²的值.
![已知(x+3)²+|x-y+10|=0,求5x²y-[2x²y-(3xy-xy²](/uploads/image/z/15971046-6-6.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%88x%2B3%EF%BC%89%26sup2%3B%2B%7Cx-y%2B10%7C%3D0%2C%E6%B1%825x%26sup2%3By-%5B2x%26sup2%3By-%283xy-xy%26sup2%3B)
(x+3)²+|x-y+10|=0
(x+3)²=0 x=-3
|x-y+10|=0 y=7
5x²y-[2x²y-(3xy-xy²)-3x]-2xy²-y²
=5x²y-2x²y+3xy-xy²+3x-2xy²-y²
=3x²y-3xy²+3xy+3x-y²
=3*9*7+3*3*49-3*3*7-3*3-49
=189+441-72-49
=509
(x+3)²=0 x=-3
|x-y+10|=0 y=7
5x²y-[2x²y-(3xy-xy²)-3x]-2xy²-y²
=5x²y-2x²y+3xy-xy²+3x-2xy²-y²
=3x²y-3xy²+3xy+3x-y²
=3*9*7+3*3*49-3*3*7-3*3-49
=189+441-72-49
=509
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