(2m-n)的平方-(3m+2n)的平方_数学解答

(2m-n)的平方-(3m+2n)的平方

人气：221 ℃　时间：2020-04-25 06:47:19

解答

(2m-n)²-(3m+2n)²
=[(2m-n)+(3m+2n)][(2m-n)-(3m+2n)]
=(2m-n+3m+2n)(2m-n-3m-2n)
=-(5m+n)(m+3n)