1-(x-y)/x+2y÷(x²-y²)/(x²+4xy+4y²)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(-4X²Y)(-X²Y²)÷1\2XY 的三次方
已知2x+y=0,求x-2y/x²+xy*(x²-y²)/x²-4xy+4y
谢谢(关于因式分解)2x²+xy-y²-4x+5y-6x²-2x-14(x-y+1)+y(
(x-2y)²+(2x-4y)(x+y)+(x+y)²
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
计算 2xy[4x²y²-3y(xy+x²y)-xy²]