5-0.9*0.2+1.8除以零点五等于多少,用简便方法计算
问题描述：
5-0.9*0.2+1.8除以零点五等于多少,用简便方法计算
答
5-0.9*0.2+1.8除以零点五
=5-0.9*0.2+1.8*2
=5-0.18+3.6
=8.6-0.18
=8.42