若x^3y^m-1*x^m+n*y^2n+2=x^9y^9,则4m-3n=（）.

(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 若椭圆x*x/m*m+y*y/n*n=1(m,n>0)过点(3,1),求m*m+n*n的最小值 若x^3y^m-1*x^m+n*y^2n+2=x^9y^9,则4m-3n=（）. 若3x^m+1y^2与x^3y^n的积是单项式3x^5y^5则n^m+m^n= 若[-3(x+y)^m*(x-y)^2n]^2*[-(x+y)^2]=-a(x+y)^10*(x-y)^12-n,求m,n的值 设集合M={x/x=3m+1,m属于Z},N={y/y=3n+2,n属于Z},若x属于M,y属于N,则xy与集合M,N的关系 若2x^m-n+1y^3m-2n-5与-3x^n-1y是同类项,则m=___,n=____RT 若代数式2x^2 y^m与-1/3x^n y^3是同类项,则m+n= 若3x^3y^n+(-2x^m-1y)的结果是一单项式,则(-m)^n= 已知x^m+n=3,y^m-n=2,求代数式(-1/3x^2m+n·y^5m-6n)·(1/2x^m+2n·y^2n-m) 已知(m+n)x^n·y^m-2·(3xy^2+5x^2·y)=21x^m·y^n+1+35x^m+1·y^n,求m和n 2y(x-y)^2-(y-x)^3过程具体!(1)2y(x-y)^2-(y-x)^3(2)(m-n)^3+m（n-m）^2-n（m-n）^2 1)x^2-y^2-x+四分之一2)9m^2-n^2+3m-n 若3x^n-1y^2-m和-2x^4+m y^n+1是同类项,则m= n= 若3x^n-1y^2-m和-2x^4+m y^n+1是同类项,则m= n= 若3X^2m+n+1+5y^m-2n-1+0是关于X,Y的二元一次方程,则m=?,n=?