| 看誰算得準(能簡算要簡算). ①
|
②1.05×(3.8-0.8)÷6.3 | ③
| ||||||||||||||
④2008×
|
⑤(
|
⑥
|
| 1 |
| n(n+1) |
| 1 |
| n |
| 1 |
| n+1 |
| 7 |
| 8 |
| 7 |
| 8 |
| 7 |
| 8 |
| 1 |
| 5 |
| 7 |
| 8 |
| 1 |
| 2 |
| 7 |
| 40 |
| 7 |
| 16 |
| 14 |
| 80 |
| 35 |
| 80 |
| 49 |
| 80 |
| 9 |
| 20 |
| 1 |
| 2 |
| 2 |
| 5 |
| 4 |
| 5 |
| 9 |
| 20 |
| 1 |
| 2 |
| 6 |
| 5 |
| 9 |
| 20 |
| 5 |
| 3 |
| 3 |
| 4 |
| 2006 |
| 2007 |
| 2006 |
| 2007 |
| 2006 |
| 2007 |
| 2006 |
| 2007 |
| 2006 |
| 2007 |
| 2006 |
| 2007 |
| 1 |
| 15 |
| 2 |
| 17 |
| 1 |
| 15 |
| 2 |
| 17 |
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 99×100 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 99 |
| 1 |
| 100 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 99 |
| 1 |
| 100 |
| 1 |
| 100 |
| 99 |
| 100 |
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