(2m-n)的平方-(3m+2n)的平方

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(2m-n)的平方-(3m+2n)的平方(2m-n)的平方-(3m+2n)的平方(2m-n)的平方-(3m+2n)的平方(2m-n)²-(3m+2n)²=[(2m-n)+(3m+2

(2m-n)的平方-(3m+2n)的平方
(2m-n)的平方-(3m+2n)的平方

(2m-n)的平方-(3m+2n)的平方
(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)

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