| 脱式计算,能简算的要简算: 4.67-(2.98+0.67); | 8×0.4×12.5×2.5; | |
| 125×(8+0.8+0.08); | 1.89×0.9+0.189; | 23.8×99+2.38. |
估算.
| 68×102≈ | 396×41≈ | 92×28≈ | 198×21≈ |
直接写得数.
| 14×20= | 2× | 1+ | ( |
| 72÷ | 1.5×100= | 1.25×8= | 99×0.8+0.8= |
| 3.14×20= | 2× | 1+ | ( |
| 72÷ | 1.5×100= | 1.25×8= | 99×0.8+0.8= |
| 脱式计算,能简算的要简算: 4.67-(2.98+0.67); | 8×0.4×12.5×2.5; | |
| 125×(8+0.8+0.08); | 1.89×0.9+0.189; | 23.8×99+2.38. |
| 68×102≈ | 396×41≈ | 92×28≈ | 198×21≈ |
| 14×20= | 2× | 1+ | ( |
| 72÷ | 1.5×100= | 1.25×8= | 99×0.8+0.8= |
| 3.14×20= | 2× | 1+ | ( |
| 72÷ | 1.5×100= | 1.25×8= | 99×0.8+0.8= |