提取1/13后得
（4*2+1*6+2*6）/13=26/13=2
数学简便运算：4／13×2＋1／13×6＋2／13×6
数学简便运算：4／13×2＋1／13×6＋2／13×6
数学人气：757 ℃时间：2020-04-14 04:02:46
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