7/4÷(2/3+1/2)×4/5(能简算的要简算)

问题描述:

7/4÷(2/3+1/2)×4/5(能简算的要简算)

7/4÷(2/3+1/2)×4/5
=7/4×4/5÷(4/6+3/6)
=7/5÷7/6
=7/5×6/7
=6/5