(2m减3n)平方减2m加3n

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(2m减3n)平方减2m加3n
(2m减3n)平方减2m加3n

(2m减3n)平方减2m加3n
(2m-3n)²-2m+3n
=(2m-3n)²-(2m-3n)
=(2m-3n)(2m-3n-1)