52乘以11.1减2.6乘以77.8简算

分类: 作业答案 • 2021-12-03 21:44:27

问题描述：

答

52×11.1 - 2.6×77.8
=2.6×20×11.1 - 2.6×77.8
=2.6×(20×11.1 - 77.8)
=2.6×(222 - 77.8)
=2.6×144.2
=374.92