简便计算:7.5÷12+12÷7.5-0.225
问题描述:
简便计算:7.5÷12+12÷7.5-0.225
答
7.5÷12+12÷7.5-0.225
=2.5/4+4/2.5-9/40
=25/40+64/40-9/40
=80/40
=2