①1.44÷1.56×13②3.7×2.2＋3.9×7.4 简便计算

分类: 作业答案 • 2021-12-19 15:52:04

问题描述：

答

①1.44÷1.56×13
=1.44÷1.2÷1.3×13
=1.2÷0.1
=12
②3.7×2.2＋3.9×7.4
=3.7×2.2＋7.8×3.7
=3.7×（2.2+7.8）
=3.7×10
=37