-(m+n)^2+6(m+n)-9
-(m+n)^2+6(m+n)-9
m-{n-2m+[3m-(6m+3n)-5n]}化简
化简m/(m+n)²+n/m²-n²-2n²/(m+n)(m²-n
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
(m+2n)-6(m+2n)(2m-n)+9(n-2m) 因式分解
计算(3-m+n)*(3+m-n)-(2-m+n)*(2+m-n)
(3m-4n)(4n+3m)-(2m-n)(2m+n)
已知:m*m=n+2,n*n=m+2.求m*m*m-2mn+n*n*n(m不等于n).
(m-n)立方;+2n(n-m)平方
(m+n)(m-n)-(1-2n)化简
先化简再求值:(2m-n)(m+n)+(m-n)²-(6m³-4m²n)÷2m,其中m=2
【(m+n)(m-n)-(m-n²)+2n(m-n)】÷4n