来自凌玉华的问题
化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],其中X=-3/2,Y=-2
化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],其中X=-3/2,Y=-2
3回答
2020-09-30 08:46
化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],其中X=-3/2,Y=-2
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
1/9x(-3/2)³x(-2)^4=-1/9x27/8x16??1/9=-1/9???
(-3/2)³=-27/8呀,把负号放前面