能简算的要简算1349×21+28×1349；（34+58）×32；72×571．
2023-04-26
问题描述：
能简算的要简算| 13 |
| 49 |
| 13 |
| 49 |
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 71 |
最佳答案：
（1）
| 13 |
| 49 |
| 13 |
| 49 |
=
| 13 |
| 49 |
=
| 13 |
| 49 |
=13
（2）（
| 3 |
| 4 |
| 5 |
| 8 |
=
| 3 |
| 4 |
| 5 |
| 8 |
=24+20
=44
（3）72×
| 5 |
| 71 |
=（71+1）×
| 5 |
| 71 |
=71×
| 5 |
| 71 |
| 5 |
| 71 |
=5+
| 5 |
| 71 |
=5
| 5 |
| 71 |
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=
=
=13
（2）（
=
=24+20
=44
（3）72×
=（71+1）×
=71×
=5+
=5