递等式计算(能简算的要简算)
| 4.65-2.55-1.45 | 6.4÷(0.3×2+0.2) | 201×6.5-6.5 | 2.2×0.25+2.8×0.25. |
解方程:
| ①4x+3.7=6.5 | ②4x-20%x=1.9 | ③3.8× | ④0.4(3+x)=30× |
直接写出得数.
| 5×72= | 500×6= | 125×3= | 300÷6= | 90÷6= | 78÷3= |
| 59×3≈ | 104×6≈ | 88×5≈ | 81÷4≈ | 65÷8≈ | 68÷5≈ |
| 4.65-2.55-1.45 | 6.4÷(0.3×2+0.2) | 201×6.5-6.5 | 2.2×0.25+2.8×0.25. |
| ①4x+3.7=6.5 | ②4x-20%x=1.9 | ③3.8× | ④0.4(3+x)=30× |
| 5×72= | 500×6= | 125×3= | 300÷6= | 90÷6= | 78÷3= |
| 59×3≈ | 104×6≈ | 88×5≈ | 81÷4≈ | 65÷8≈ | 68÷5≈ |