题目内容
4
+2.25+5
+7
．
| 3 |
| 8 |
| 5 |
| 8 |
| 3 |
| 4 |
4
+2.25+5
+7
，
=（4
+5
）+（7
+2
），
=10+10，
=20．
| 3 |
| 8 |
| 5 |
| 8 |
| 3 |
| 4 |
=（4
| 3 |
| 8 |
| 5 |
| 8 |
| 3 |
| 4 |
| 1 |
| 4 |
=10+10，
=20．
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