1.简算1×1/27+5/9×1/27+4/9÷27
问题描述：
1.简算1×1/27+5/9×1/27+4/9÷27
2×1/27+5/9×1/27+4/9÷27 (第一个数打错了是2）
答
2×1/27+5/9×1/27+4/9÷27
=(2+5/9+4/9) *1/27
=3*1/27
=1/9