化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],其中X=-3/2,Y=-2
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化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],其中X=-3/2,Y=-2
先化简在求值
(-1/3XY)²×[xy(2x-y)-2x(xy-y)²],
=1/9x²y²*(2x²y-xy²-2x²y+2xy²)
=1/9x²y²*xy²
=1/9x³y^4
=1/9x(-3/2)³x(-2)^4
=-1/9x27/8x16
=-6
再问: 1/9x(-3/2)³x(-2)^4 =-1/9x27/8x16 ?? 1/9=-1/9???
再答: (-3/2)³=-27/8 呀,把负号放前面
(-1/3XY)²×[xy(2x-y)-2x(xy-y)²],
=1/9x²y²*(2x²y-xy²-2x²y+2xy²)
=1/9x²y²*xy²
=1/9x³y^4
=1/9x(-3/2)³x(-2)^4
=-1/9x27/8x16
=-6
再问: 1/9x(-3/2)³x(-2)^4 =-1/9x27/8x16 ?? 1/9=-1/9???
再答: (-3/2)³=-27/8 呀,把负号放前面
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