简便运算。
|
| (1)原式= 47×(29+71) = 47×100 = 4700 | (2)原式=92×(99+1) =92×100 =9200 |
| (3)原式=(200+1)×23 = 4600+23 = 4623 | (4)原式=125×8×2 =1000×2 =2000 |
| (5)原式=20×15+6×15 =300+90 =390 | (6)原式=25×(40+1) =1000+25 =1025 |
编辑:chaxungu时间:2026-04-27 13:19:22分类:小学数学题库
简便运算。
|
| (1)原式= 47×(29+71) = 47×100 = 4700 | (2)原式=92×(99+1) =92×100 =9200 |
| (3)原式=(200+1)×23 = 4600+23 = 4623 | (4)原式=125×8×2 =1000×2 =2000 |
| (5)原式=20×15+6×15 =300+90 =390 | (6)原式=25×(40+1) =1000+25 =1025 |