1.12+【（1.5+2又三分之二）÷3.75-0.4】÷8又九分之八
=1.12+[(3/2+8/3)÷(15/4)-2/5]÷(80/9)
=1.12+32/45×9/80
=1.12+0.08
=1.2;
手机提问的朋友在客户端右上角评价点【满意】即可.