x^3y^2+6x^2y+9x
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
因式分解3x^2(x-y)+6x(y-x)
计算:(2/3x√9x+6x√y/x)+(y√x/y-√1/x)
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解
2(2x+3y)(3x+2y)-(6x-y)(2x-5y)
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
2(y-x)的平方-7(x-y)+6(x-y)-3(y-x)的平方