已知|X+3|+(b-3/I)的平方=0化简多项式3x平方y-[2xy平凡-2(XY-2/3X平凡y)-XY]+3xy平

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已知|X+3|+(b-3/I)的平方=0化简多项式3x平方y-[2xy平凡-2(XY-2/3X平凡y)-XY]+3xy平方

优质解答：

|x+3|+(y-1/3)的平方=0

|x+3|=0,(y-1/3)的平方=0

x=-3

y=1/3

3x²y-[2xy²-2(xy-2/3x²y)-xy]+3xy²

=3x²y-[2xy²-2xy+4/3x²y-xy]+3xy²

=3x²y-[2xy²-2xy-xy+4/3x²y]+3xy²

=3x²y-[2xy²-3xy+4/3x²y]+3xy²

=3x²y-2xy²+3xy-4/3x²y+3xy²

=3x²y-4/3x²y+3xy²-2xy²+3xy

=5/3x²y+xy²+3xy

=xy(5/3x+y+3)

=-3*1/3*[5/3*(-3)+1/3+3]

=-(-5+4/3)

=-(-11/3)

=11/3

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