要过程2ab²*(-3ab),4x²y*(-xy²)³
用分式表示下列各式的商,并化简:(1)6ab÷(-18ab³);(2)(2x+y)÷(y²+4xy+
(x-y)/(2x+2y)与(xy)/(x+y)²通分要过程
通分(1)6c/a²b与c/3ab² (2)x - y/2x+3y与xy/(x+y)²
分式除法(2y-x)÷x²-4xy+4y²/x+3xy要过程
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
如果(x+ay)(x+by)=x²-4xy+6y²求-3(a+b)-2ab的值
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
约分 (6ab²)/(8b³) (x³-2x²y)/(x²y-2xy&
计算:(-2x²y³)²×(xy)³要过程
因式分解4x²+4xy-2ax+2bx+y²-ay+by-ab
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
-2y³+(3xy²-x²y)-2(xy²-y³)