85÷1.70÷0.5 (21.6+1.89)÷0.9 这两道题怎样用简便方法计算
问题描述:
85÷1.70÷0.5 (21.6+1.89)÷0.9 这两道题怎样用简便方法计算
答
85÷1.70÷0.5
=850÷17×2
=50×2
=100
(21.6+1.89)÷0.9
=21.6÷0.9+1.89÷0.9
=24+2.1
=26.1