题目内容
χ-
x=
．
| 7 |
| 8 |
| 1 |
| 20 |
x-
x=
，
x=
，
x÷
=
÷
，
x=
．
| 7 |
| 8 |
| 1 |
| 20 |
| 1 |
| 8 |
| 1 |
| 20 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 20 |
| 1 |
| 8 |
x=
| 2 |
| 5 |
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| 7 |
| 8 |
| 1 |
| 20 |
| 7 |
| 8 |
| 1 |
| 20 |
| 1 |
| 8 |
| 1 |
| 20 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 20 |
| 1 |
| 8 |
| 2 |
| 5 |
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