9(2m+n)^2-4(m-2n)^2
[(m+n)(m-n)-(m-n)²+2n(m-n)]÷4n
[(m-n)^2*(m-n)^3]^2/(m-n)^4
因式分解4m^2(m-n)+4n(n-m)
(m-n)2(n-m)3(n-m)4化简
m-n+2n^2/(m+n)
(m-n)^2 +n(n- m)
(m-n)+2n(m-n)
(m+2n)-6(m+2n)(2m-n)+9(n-2m) 因式分解
(3m-2n)^+(3m+2n) (3m-2n)-9(m+n)^
(3m-4n)(4n+3m)-(2m-n)(2m+n)
[2(m+n)^5-3(m+n)^4+(-m-n)^3]÷[2(m+n)^3]
计算(m+4n)(m-n)-6(m+2n)(m-3n)