脱式计算(能简算得要简算)
| 6×99+25.6 | 4500÷4÷25 | 38.125-(12.125+4.6) |
| 300-(15+420÷21) | 17×23-23×7 | 4.8+1.37+5.2+12.63. |
| 6×99+25.6 | 4500÷4÷25 | 38.125-(12.125+4.6) |
| 300-(15+420÷21) | 17×23-23×7 | 4.8+1.37+5.2+12.63. |