[(123×2+2.5)÷78-215]÷1.6[(514-4.25)×58]÷38+33÷116[(915-3.2)÷212]×[1÷(2.1-29100)]9.75+99.75+999.75+9999.75123-[(3.62×215+6.38÷712)×1.82-113×0.82]2890-数学
| 5 |
| 8 |
| 3 |
| 8 |
| 11 |
| 6 |
=
| 5 |
| 8 |
| 8 |
| 3 |
| 6 |
| 11 |
=
| 5 |
| 3 |
=19
| 2 |
| 3 |
③[（9
| 1 |
| 5 |
| 1 |
| 2 |
| 9 |
| 100 |
=[6×
| 2 |
| 5 |
| 1 |
| 100 |
=
| 12 |
| 5 |
=240；
④9.75+99.75+999.75+9999.75
=（9+1）+（99+1）+（999+1）+（9999+1）-4+0.75×4，
=10+100+1000+10000-4+3，
=11110-1，
=11109；
⑤1
| 2 |
| 3 |
| 2 |
| 15 |
| 1 |
| 2 |
| 1 |
| 3 |
=1
| 2 |
| 3 |
| 2 |
| 15 |
| 2 |
| 15 |
| 4 |
| 3 |
=1
| 2 |
| 3 |
