2x²(2分之1xy²-y)-(x²y²)×(-3x) -2y ²(x
化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
已知y分之x=3,求x²-xy+y²分之x²+2xy-3y²
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)
计算:2x+2y分之3y + x²+xy分之2xy
2x+2y分之3y 加 x²+xy分之2xy
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
【分解因式】 x²-xy+4分之1y² x²y-2xy²+y³ a(x
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
计算:1、(xy分之x²-y²)×(x-y分之x)-(y分之x);
x²-2xy+y²分之x²+2xy-3y³如何因式分解