用简便方法计算.
1.7+3.98+ | ×51 |
5.73-3+(4.27-2) | 45×2.08+1.5×37.6 |
99999×77778+33333×66666 | ; |
+++…+ | ++++. |
脱式计算下面各题:
(1)÷- | (2)() |
(3)()×(+) | (4)1-(+) |
1.7+3.98+ | ×51 |
5.73-3+(4.27-2) | 45×2.08+1.5×37.6 |
99999×77778+33333×66666 | ; |
+++…+ | ++++. |
(1)÷- | (2)() |
(3)()×(+) | (4)1-(+) |