[(m-n)^2*(n-m)^3]^2/(m-n)^4 [(-x^5)^2]^3/[(x^4)^2/(x^2)^3]

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)( 已知m,n都是正整数,则多项式-2x^n+3x^m+4x^m+n的次数是 把下列各式因式分解(2m+3n)(2m-n)-4n(2m-n)(x+y)^2(x-y)+(x+y)(y-x)^24a(x 计算：(m+2n)/(n-m)+n/(m-n)-2m(n-m)和[(x+2)/(x×x-2x)-(x-1)/(x×x-4 计算（1）（3m-4n)(3m+4n)-(2m-2n)(2m+n) (2)(x+5y)²-(x-5y) 若不等式(m+n)x+(2m-3n) 设不等式（m+n）x+（2m-3n) 设不等式(m+n)x+(2m-3n) 分式计算题2道 3x/(x-3)² - x/3-x m+2n/n-m + m/n-m - 2m/n-m 已知M= {1,2,3,4 },N= {2,3,5,7 }.定义M-N= {x|x∈M,且x∉N },则M- 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 已知x^m=3,x^n=6 求 x^m-n,x^3m-2n的值