
已知(x-3)²+|y+2|=0,求代数的值:(2x²y-4xy²)-(-3xy²+x²y)
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(x-3)²+|y+2|=0
(x-3)²=0,|y+2|=0
x=3,y=-2
(2x²y-4xy²)-(-3xy²+x²y)
=2x²y-4xy²+3xy²-x²y
=2x²y-x²y-4xy²+3xy²
=x²y-xy²
=xy(x-y)
=-2*3*[3-(-2)]
=-6*5
=-30
(x-3)²=0,|y+2|=0
x=3,y=-2
(2x²y-4xy²)-(-3xy²+x²y)
=2x²y-4xy²+3xy²-x²y
=2x²y-x²y-4xy²+3xy²
=x²y-xy²
=xy(x-y)
=-2*3*[3-(-2)]
=-6*5
=-30
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