用递等式计算（能简单的要简单）①59+49×920÷65②1113+712-（1113-512）③（1-25%）×101-34④197×198+198⑤23÷[34×（1718-89）]⑥12007×2001+52007+12007⑦312：x=134：（1.6×5）-数学
| 9 |
| 20 |
| 6 |
| 5 |
=
| 5 |
| 9 |
| 1 |
| 5 |
| 5 |
| 6 |
=
| 5 |
| 9 |
| 1 |
| 6 |
=
| 10 |
| 18 |
| 3 |
| 18 |
=
| 13 |
| 18 |
②
| 11 |
| 13 |
| 7 |
| 12 |
| 11 |
| 13 |
| 5 |
| 12 |
=
| 11 |
| 13 |
| 11 |
| 13 |
| 7 |
| 12 |
| 5 |
| 12 |
=1；
③（1-25%）×101-
| 3 |
| 4 |
=75%×101-75%，
=（101-1）×75%，
=100×75%，
=75；
④197×
| 1 |
| 98 |
| 1 |
| 98 |
=（196+1）×
| 1 |
| 98 |
| 1 |
| 98 |
=196×
