m^5n^5-2n^3m^3 mn(请快速回答问题,x+y=0.x+3y=1，求3x^2+12xy+12y^2

1/M+1/N=5 (3M+MN+2N) / (M-MN=3N) (3m-5n+4mn)-(2m-4n+6mn) mn=-5 m-n=7快帮我打答吧!谢谢了! (5mn-2m+3n)+(-7m-7mn) (5mn-2m+3n)+(-7m-7mn) (m-n)(m^5+m^4n+m^3n^2+m²n^3+mn^4+n^5) m+n=5,mn=14,则(3m-2n)-(-5n+mn) 已知mn/m+n=2求3m-5mn+3n/-m+3mn-n 已知M+N分之MN=2,求-m+3mn-n分之3m-5mn+3n 已知mn/m+n=2,求3m-5mn+3n/（-m）+3mn-n 已知mn／m+n=2,求3m-5mn+3n/-m+3mn-n的值 m-n=7 mn=-5求(3m+5n+4mn)-(2n-4n+6mn) 若m-n=4,mn=-1,求(-2mn+m+n)-(3mn+5n-5m)-(m+4n-3mn)的值 -2(mn-3m²)-[m²-5(mn-m²)+2mn],其中m=1,n=-2 快. 3(m^2-mn+2n^2)-2(mn-m^2+n^2)+(5mn-4n^2+1) 已知m-n=7,mn=2 求5n-3mn+5m+2 (a^m)^n*(-a^3m)2n/(a^mn)^5-a^2mn 7m²n-3mn²+5m²n+2mn² 已知MN^2=-6,求-MN(M^2N^5-MN^3-N)的值