x²-2xy+y²分之2x²y-2xy²,x=1,
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
已知y分之x=3,求x²-xy+y²分之x²+2xy-3y²
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
x²+y²+2xy分之x²-4y² ÷x²+xy分之2y+x
(x²+2xy+y²分之x²-4y²)÷(x²+xy分之x+2y)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算:2x+2y分之3y + x²+xy分之2xy
2x+2y分之3y 加 x²+xy分之2xy
已知y=2x,求(x²-xy-2y²)分之(x²+2xy+y²)
【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a(x
化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=