五年级练习题简便算法39.72.8+3.9772 0.3724000.25+38.75+2.82530

分类: 作业答案 • 2022-02-14 17:00:41

问题描述：

五年级练习题简便算法
39.7*2.8+3.97*72 0.37*2400*0.25+3*8.75+2.825*30

答

39.7×(2.8+7.2)=397, 0.37×200×(0.25×12)+3×8.75+3×28.75=(74+8.75+28.25)×3=111×3=333

五年级练习题简便算法39.7*2.8+3.97*72 0.37*2400*0.25+3*8.75+2.825*30