(2m-n)²-(n-2m)²

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(2m-n)²-(n-2m)²(2m-n)²-(n-2m)²(2m-n)²-(n-2m)²(2m-n)²-(n-2m)²

(2m-n)²-(n-2m)²
(2m-n)²-(n-2m)²

(2m-n)²-(n-2m)²
(2m-n)²-(n-2m)²
=(2m-n+n-2m)(2m-n-n+2m)平方差公式
=0*(4m-2n)
=0