| 简便计算。 | ||||
|
| (1)531﹣57﹣143 =531﹣(57+143) =531﹣200 =331 | (2)84×25 =21×4×25 =21×(4×25) =21×100 =2100 |
| (3)147×38+53×38 =(147+53)×38 =200×38 =7600 | (4)7200÷45÷2 =7200÷(45×2) =7200÷90 =80 |
编辑:chaxungu时间:2026-04-27 13:19:05分类:小学数学题库
| 简便计算。 | ||||
|
| (1)531﹣57﹣143 =531﹣(57+143) =531﹣200 =331 | (2)84×25 =21×4×25 =21×(4×25) =21×100 =2100 |
| (3)147×38+53×38 =(147+53)×38 =200×38 =7600 | (4)7200÷45÷2 =7200÷(45×2) =7200÷90 =80 |