(2m-n)^2-(3m+2n)^2

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(2m-n)^2-(3m+2n)^2(2m-n)^2-(3m+2n)^2(2m-n)^2-(3m+2n)^2(2m-n)^2-(3m+2n)^2=(2m-n+3m+2n)(2m-n-3m-2n)=(5

(2m-n)^2-(3m+2n)^2
(2m-n)^2-(3m+2n)^2

(2m-n)^2-(3m+2n)^2
(2m-n)^2-(3m+2n)^2
=(2m-n+3m+2n)(2m-n-3m-2n)
=(5m+n)(-m-3n)

(2m-n)^2-(3m+2n)^2 化简后的结果是 -5m^2-3n^2-16mn