15.6\4/9+22/5*2.25简算

问题描述:

15.6\4/9+22/5*2.25简算

15.6\4/9+22/5*2.25
=15.6×9/4+4·4×9/4
=9/4×(15.6+4·4)
=9/4×20
=45