(-1/2m^2-1/3mn+1)·(-1/4m^3n)只要答案就行正在纠结算法阿~

3mn^2·1/2mn^2 +3/2m(mn)^2 -2(mn-3m平方)-{m平方-5(mn-m平方)+2mn,其中m=1,n=-2 已知m-n=2,mn=1,求多项式(-2mn+2mn+3n)-(3mn+2n-2m)-(m+4n+mn)的值 已知m-n=2,mn=1,求多项式(-2mn+2mn+3n)-(3mn+2n-2m)-(m+4n+mn)的值 计算(-2mn)^3(mn+1/2)(m^2n^2-1/2mn+1/4) 1/M+1/N=5 (3M+MN+2N) / (M-MN=3N) 已知m-n=2,mn=1,求多项式(2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值 已知｜m-n-2｜与（mn-1)^互为相反数,求（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值 已知m-n=3,mn=-1,求多项式-2mn+2m+3n-3mn-2n+2m-4n-m-mn的值 已知m-n=4,mn=-1,求（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn）的值. 若m-n=4,mn=-1,求（-2mn+2m+3n）-（3mn+2n-2m）-（m+4n+mn） 若m-n=4,mn=-1求(9-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn) 已知m-n=4,mn=-1,求（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值 若m-n=4,mn=-1,求(-2mn+m+n)-(3mn+5n-5m)-(m+4n-3mn)的值 已 知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值 m+n=-3,mn=2,求-3（1/3n-mn)+2(mn-1/2m) 3(m^2-mn+2n^2)-2(mn-m^2+n^2)+(5mn-4n^2+1) (m^2-2m+3)(5m-1)求解答还有3mn^2*1/2mn^2+3/2m(mn)^2急