2x^6n-x^4n×y^3m-y^9m,已知x^2n=3,y^3n=2,求值

4x^(m+6)y^2+X^3y^n=单项式,m^n= 2x^6n-x^4n×y^3m-y^9m,已知x^2n=3,y^3n=2,求值 分解因式：(x+y)(x-y)-(x+y)² 3m(m-n)+6n(n-m) x(x-y)-y(y-x) (x-3)²+（3x-9)(x+y)(x-y)-(x+y)² 3m(m-n)+6n(n-m) x(x-y)-y(y-x) (x-3)²+（3x-9) 3x+4y=-5 5x+6y=-9 (n-8m)x-8y=10 5x+(10m+2n)y=-9 求m.m+n.n=? (x+y)(m+n)2-(x+y)(m+n)2 x^n*y*(-x^2y^m) m(x-y)^n+n(y-x)^2n因式分解 若x^3y^m-1*x^m+n*y^2n+2=x^9y^9,则4m-3n=（）. 提公因式分解6(m-n)^2+3(m-n)、 2（x-y)-(x-y)^2 计算：1.[(m+n)(n-m)-(m+n)^2+3m(m+n)]除以（-2M),其中m=-4,n=2 2.(x+y)(-x+y)-(x-y)^2-(X^2y-xy^2)除 2m+n 5 3 2m-n诺4x y 与x y 是同类项,m/n= 已知-7x^m-2n y^4与9分之8x^5 y^m+n 是同类项,求（m-2n)^2 -3(m+n)-5(m-2n)^2 +m+n的值 因式分解：4/9x^2-2x+9/4(3m+n)(2m-n)-(m+3n)(n-2m)5(x-y)^2+7(x-y)-6 4（x-y）三次方-2y（y-x）平方 3m（m-n）平方-6n（n-m） 已知多项式4x^n y^m z+2x^n-1 y^m+2 z^2+6x^n-2 y^m+1 z各项的公因式是2x^3y^4z,求m,n 已知多项式4x^n y^m z+2x^n-1 y^m+2 z^2+6x^n-2 y^m+1 z各项的公因式是2x^3y^4z,求m,n -x^6n-y^3m因式分解 1.7x^4-11x^2y^2-6y^42.2(m+n) ^2+(m+n)-33.4(x-2y) ^2-8x+16y+3