(x+y)^2-6x^2+6y^2+9(x-y)^2的解
2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方
计算:(x-y)^2*(y-x)^2*(x-y)^6
6(x+y)2-2(x-y)(x+y)因式分解
9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
-6x-y-7x+6x-2y-10x+8y+x+6x-8y的值
因式分解3x^2(x-y)+6x(y-x)
求x+y/3+x-y/2=6 3(x+y)-2(x-y)=28方程组的解
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
已知方程组{2x+y=6 x+2y=9},求x+y与x-y的值
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
(x+y)(x-y)+(x-y)的平方-(6X的平方Y-2XY的平方)/2Y