x+x+2x+2x+3x+4x=39
怎么算?急 写过程和结果
人气：310 ℃ 时间：2020-03-23 19:05:15
解答
（1＋1＋2＋2＋3＋4）x＝39
13x＝39
x＝39/13
x＝3
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