4.6*5/8+6.4+8/5-5/8

问题描述:

4.6*5/8+6.4+8/5-5/8

4.6*5/8+6.4+8/5-5/8
=5/8*(4.6-1)+6.4+1.6
=5/8*3.6+8
=2.25+8
=10.25