m+2n=2,3m+4n=8.m+n=?
人气:285 ℃ 时间:2020-02-03 20:50:30
解答
因为m+2n=2,3m+4n=8
所以(3m+4n)-(m+2n)=2m+2n=2(m+n)=8-2=6
所以m+n=6/2=3
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