太多了吧
(3/4－1/6)÷(11/12+1/3)
=(9/12-2/12)÷(11/12+4/12)
=(7/12)÷(15/12)
=7/15
1+(1/4+3/8)÷1/4
=1+1/4÷1/4+3/8÷1/4
=1+1+3/2
=7/2
55×7/54
=(54+1)×7/54
=54×7/54+1×7/54
=7+7/54
=7又7/54
剩下的
重新问