15.37×7.88-9.37×7.88+15.37×2.12-9.37×2.12的简便计算

分类: 作业答案 • 2021-12-19 19:36:18

问题描述：

答

15.37×7.88-9.37×7.88+15.37×2.12-9.37×2.12
=15.37x(7.88+2.12)-9.37x(7.88+2.12)
=15.37x10-9.37x10
=153.7-93.7
=60