若1/m-1/n=3,求2m-3mn-2n/m-2mn-n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) 若m-n=4,mn=-1,求(-2mn+m+n)-(3mn+5n-5m)-(m+4n-3mn)的值 若1/m-1/n=3,求2m-3mn-2n/m-2mn-n的值 若(1/m)-(1/n)=4,求(2m-3mn-2n)/(m-2mn-n)的值 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 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=2,mn=1,求多项式(2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值 已知m-n=4,mn=-1,求（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn）的值. 已知m-n=4,mn=-1,求（-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值 已 知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值 若m+m=3,mn=-2,求2(-mn+3n+4m)-1/2(14n十18m-mn)的值. m^2+n^2+1=mn+m+n,求3m-4n 若m-n=4,mn=-1,求代数式（9-2mn+2m+3n)-(m+4n+mn）的值 已知1/m-1/n=2,试求(3m+mn-3n)/(m-mn-n)的值 1/M+1/N=5 (3M+MN+2N) / (M-MN=3N) m+n=-3,mn=2,求-3（1/3n-mn)+2(mn-1/2m)