化简再求值 4x³(-y³)²-3x×(-x)²(-y²)³
化简再求值 4x³(-y³)²-3x×(-x)²(-y²)³
先化简,再求值:(3x²y-2)×y-(9x的4次方y³-15x²y²)÷(3x
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
求值:(-3x³y)²+(2x²﹚³·﹙﹣y﹚²﹢4x的6次方y
先化简,后求值(-4x²)÷(-2x)+12x³y²÷(-4x²y)-24x四次
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
化简并求值:4x³(-y³)²-3x·(-x)²(-y²)³
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
因式分解 -5x³y(x-y)³+20y【x²(y-x)】²
先化简再求值 :[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x=—2,y=5
先化简,再求值,先化简,再求值,【1/(x-y)】-【1/(x+y)】/【xy²/(x²-y
[x(x²y²-xy)-y(x²-x³y)]÷3x²y