8又5分之4÷[7.8+5/8*(2又3/4-1.15)]
=8又5分之4÷[7.8+5/8*1.6]
=8又5分之4÷[7.8+1]
=8.8÷8.8
=1
8又5分之4÷[7.8+5/8*(2又3/4+1.15)]
8又5分之4÷[7.8+5/8*(2又3/4+1.15)]
数学人气：693 ℃时间：2020-05-19 22:05:19
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