①1.44÷1.56×13②3.7×2.2+3.9×7.4 简便计算

问题描述:

①1.44÷1.56×13②3.7×2.2+3.9×7.4 简便计算

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