能简便的要简便．①（78-516）×（59+23）②813÷7+17×613③234×25+14÷52④16÷[917×（34+23）]⑤1213×37+47×1213+1213⑥99×99100⑦100×9899．-数学
=
| 11 |
| 18 |
②
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=（
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
③2
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
| 5 |
| 2 |
=2
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
=（2
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 5 |
=3×
| 2 |
| 5 |
=
| 6 |
| 5 |
④
| 1 |
| 6 |
| 9 |
| 17 |
| 3 |
| 4 |
