4.2霧3.5用简便计算怎么算

2025-04-13 06:33:12
推荐回答(2个)
回答1:

解:原式=4.2÷(7x0.5)
=4.2÷7÷0.5
=0.6÷0.5
=1.2
分析:主要考察拆分法的运用。

回答2:

4.2÷3.5
=4.2÷0.7÷5
=6÷5
=1.2