8又五分之四除以中括号7.8+八分之五乘小括号二又四分之三-1.15
=8又五分之四/[7.8+5/8 *(2.75-1.15)]
=8又五分之四/[7.8+5/8 *1.6]
=8又五分之四/[7.8+1]
=8.8/8.8
=1