已知4m+n=90,2m-3n=10.求(m+2n)平方-(3m-n)平方的值.
人气：143 ℃ 时间：2019-08-17 21:47:54
解答
(m+2n)平方-(3m-n)平方
=(m+2n+3m-n)(m+2n-3m+n)
=(4m+n)(-2m+3n)
=90×（-10）
=-900
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