| 用简便方法计算。 | ||||
|
| (1)19.4-1.28-3.72 =19.4-5 =14.4 | (2)1.25×0.25×32 =1.25×8×(4×0.25) =10 |
| (3)31.7×0.9+3.17 =3.17×(9+1) =31.7 | (4)2.5×4.6+0.25×46 =0.25×2×4.6 =23 |
编辑:chaxungu时间:2026-04-27 13:34:00分类:小学数学题库
| 用简便方法计算。 | ||||
|
| (1)19.4-1.28-3.72 =19.4-5 =14.4 | (2)1.25×0.25×32 =1.25×8×(4×0.25) =10 |
| (3)31.7×0.9+3.17 =3.17×(9+1) =31.7 | (4)2.5×4.6+0.25×46 =0.25×2×4.6 =23 |