2x²y-[3xy-3(xy-x²y)+x²y²] 其中x=-2 y=1 怎么算
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2x²y-[3xy-3(xy-x²y)+x²y²] 其中x=-2 y=1 怎么算解题2x²y-[3xy-3(xy-x²y)+x²y²] =2x²y-3xy+(xy-x²y)-x²y²=2x²y-3xy+3xy-3x²y-x²y²=-x²y-x²y²=-x²y(1+y)因为x=-2 y=1-x²y(1+y)=-(-2)²×1(1+1)=-8
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2x²y-[3xy-3(xy-x²y)+x²y²] 其中x=-2 y=1 怎么算
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2x²y-[3xy-3(xy-x²y)+x²y²] 其中x=-2 y=1 怎么算解题2x²y-[3xy-3(xy-x²y)+x²y²] =2x²y-3xy+(xy-x²y)-x²y²=2x²y-3xy+3xy-3x²y-x²y²=-x²y-x²y²=-x²y(1+y)因为x=-2 y=1-x²y(1+y)=-(-2)²×1(1+1)=-8
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2x²y-[3xy-3(xy-x²y)+x²y²] 其中x=-2 y=1 怎么算解题2x²y-[3xy-3(xy-x²y)+x²y²] =2x²y-3xy+(xy-x²y)-x²y²=2x²y-3xy+3xy-3x²y-x²y²=-x²y-x²y²=-x²y(1+y)因为x=-2 y=1-x²y(1+y)=-(-2)²×1(1+1)=-8
2x²y-[3xy-3(xy-x²y)+x²y²] 其中x=-2 y=1 怎么算解题2x²y-[3xy-3(xy-x²y)+x²y²] =2x²y-3xy+(xy-x²y)-x²y²=2x²y-3xy+3xy-3x²y-x²y²=-x²y-x²y²=-x²y(1+y)因为x=-2 y=1-x²y(1+y)=-(-2)²×1(1+1)=-8