约分(x²-y²)÷(3x²+6xy+3y²)
约分(x²-y²)÷(3x²+6xy+3y²)
x²-y²/3x²+6xy+3y²约分
(xy-2y)÷(x²-4x+4)约分
约分:x²+y²-9-2xy/x²-y²+6x+9
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
约分:2x²y-2xy²/x²-2xy+y²
约分:y-x/x²-y²
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6