=0.65×6.4-0.65×5.4+0.65×9，
=0.65×（6.4-5.4+9），
=0.65×10，
=6.5；
（2）12.5×0.56+1.4÷
| 2 |
| 5 |
=7+3.5，
=10.5；
（3）
| 1 |
| 2 |
| 5 |
| 6 |
| 11 |
| 12 |
| 19 |
| 20 |
| 29 |
| 30 |
| 41 |
| 42 |
| 55 |
| 56 |
| 71 |
| 72 |
| 89 |
| 90 |
=
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 4 |
| 3 |
| 4 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 7 |
| 6 |
| 7 |
| 1 |
| 8 |
| 7 |
| 8 |
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 10 |
=1+1+1+1+1+1+1+1+
| 1 |
| 10 |
=8
| 1 |
| 10 |