计算下面各题,能用简便算法的用简便算法.
| ①3871-(1080-740)×7 | ②5175÷207+102×9 |
| ③0.9+1.08+0.92+0.1 | ④13.59-6.91-0.09 |
| ⑤983×(3.8+2.2)+0.237×1000 | ⑥0.8×(35+65)×5÷100 |
| ⑦30-[17.8+(6.2+38÷10)]. |
| ①3871-(1080-740)×7 | ②5175÷207+102×9 |
| ③0.9+1.08+0.92+0.1 | ④13.59-6.91-0.09 |
| ⑤983×(3.8+2.2)+0.237×1000 | ⑥0.8×(35+65)×5÷100 |
| ⑦30-[17.8+(6.2+38÷10)]. |