1.12x²-3y²
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
因式分解:(x-y)(3x-7y)²-4(x-y)(x+y)²
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
(x-y)X(2x-2y)²X(3x-3y)²
1.12x²-3y²
因式分解:x²(x-y)+(y-x)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
(3x-y)²-2x(4x-5y)-(x+2y)²
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
【x(x²y²-xy)-y(x²-x³y)】÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
已知x,y满足x²+y²-4x+6y+13=0则(3x+y)²-(3x+y)(3x-y)的