-1/2(4xy-8x^2y^2)+1/3(xy-6x^2y^2)

tjtjtjtj2022-10-04 11:39:542条回答

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地摊上喝茅台共回答了11个问题 | 采纳率100%: -1/2(4xy-8x^2y^2)+1/3(xy-6x^2y^2)
=-2xy+4x²y²+1/3xy-2x²y²
=(1/3-2)xy+(4-2)x²y²
=-5/3xy+2x²y²; 1年前

liouxin30 共回答了1个问题 | 采纳率: -1/2(4xy-8x^2y^2)+1/3(xy-6x^2y^2)
=-2xy+4x^2y^2+1/3xy-2x^2y^2
=-5/3xy+2x^2y^2; 1年前

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化简求值：2xy-1/2(4xy-8x^2y^2)+2(3xy-5x^2y^2),其中x=1/2,y=-2/3 diney_sd1年前1: xyb2651 共回答了23个问题 | 采纳率87%

原式=2xy-2xy+4x^2y^2+6xy-10x^2y^2
=6xy-6x^2y^2
=6xy(1-xy)
xy= - 1/3 ∴原式= - 2X4/3= - 8/3

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