7m^2n-3mn^2+5m^2n+2mn^2\(≧▽≦)/~

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7m^2n-3mn^2+5m^2n+2mn^2\(≧▽≦)/~7m^2n-3mn^2+5m^2n+2mn^2\(≧▽≦)/~7m^2n-3mn^2+5m^2n+2mn^2\(≧▽≦)/~7m^2n-3

7m^2n-3mn^2+5m^2n+2mn^2\(≧▽≦)/~
7m^2n-3mn^2+5m^2n+2mn^2
\(≧▽≦)/~

7m^2n-3mn^2+5m^2n+2mn^2\(≧▽≦)/~
7m^2n-3mn^2+5m^2n+2mn^2
=（7+5）m^2n+（－3+2）mn^2
＝12m^2n-mn^2

(5mn-2m+3n)+(-7m-7mn) (5mn-2m+3n)+(-7m-7mn) 1/M+1/N=5 (3M+MN+2N) / (M-MN=3N) (m-n)(m^5+m^4n+m^3n^2+m²n^3+mn^4+n^5) m-n=7 mn=-5求(3m+5n+4mn)-(2n-4n+6mn) mn(m-n)-m(n-m)²2m(m-n)(2n-m)求过程已知m-n=7,mn=2 求5n-3mn+5m+2 7m²n-3mn²+5m²n+2mn² 若(-5/3)m-(2/7)m2,判断m+n,m-n,mn的大小关系已知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=5,mn=14,则(3m-2n)-(-5n+mn) 若m-n=4,mn=-1,求(-2mn+m+n)-(3mn+5n-5m)-(m+4n-3mn)的值若(m+n)^2-mn(m+n)=(m+n)·M,则M是（） A.m^2+n^2 B.m^2-mn+n^2 C.m^2-3mn+n^2 D.m^2+mn+n^2 已知m+n=7,mn=-5,求(m-n)(n-m)+（2m-n)+(m-2n)的值.(m-n)(n-m)+（2m-n)(m-2n) m^3n-2m^2n^2+mn^3