| 3 |
| 4 |
| 5 |
| 8 |
| 1 |
| 5 |
1
| 3 |
| 4 |
| 5 |
| 8 |
| 1 |
| 5 |
=1.75×0.625+0.2×62.5+0.625×0.05，
=1.75×0.625+20×0.625+0.625×0.05，
=（1.75+20+0.05）×0.625，
=21.8×0.625，
=13.625．
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