8又5分之4÷[7.8+5/8*(2又3/4+1.15)]

问题描述:

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)]
=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