(2m-n)的平方-(3m+2n)的平方

网友回答

(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)
======以下答案可供参考======
供参考答案1:
﹙2m－n﹚²－﹙3m＋2n﹚²
=[﹙2m－n﹚＋﹙3m＋2n﹚][﹙2m－n﹚－﹙3m＋2n﹚]
=﹙5m＋n﹚﹙－m－3n﹚
=－﹙5m＋n﹚﹙m＋3n﹚