[2又1/2-(7/9-11/12+1/6)*36]/5
问题描述：
[2又1/2-(7/9-11/12+1/6)*36]/5
答
[2又1/2-(7/9-11/12+1/6)*36]/5
=(2.5-7/9×36+11/12×36-1/6×36)÷5
=(2.5-28+33-6)÷5
=1.5÷5
=0.3;