(3m-5n+4mn)-(2m-4n+6mn) =3m-2m-5n+4n+4mn-6mn =m-n-2mn =7-2(-5) =7+10 =17 请采纳 回答
若m-n=7,mn=-5,求(3m-5n+4mn)-(2m-4n+6mn)的值.
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