(m+2n)-6(m+2n)(2m-n)+9(n-2m) 因式分解

问题描述:

(m+2n)-6(m+2n)(2m-n)+9(n-2m) 因式分解

(m+2n)-6(m+2n)(2m-n)+9(n-2m) =[m+2n+3(n-2m)]^2 =(5n-5m)^2 =25(n-m)^2