题目内容
计算：
×
÷
=______．
+
-
=______．
| 2a |
| 3b |
| b |
| 4a3 |
| 1 |
| a3 |
| 3x |
| x-4y |
| x+y |
| 4y-x |
| 7y |
| x-4y |
| 2a |
| 3b |
| b |
| 4a3 |
| 1 |
| a3 |
=
| 2a |
| 3b |
| b |
| 4a3 |
=
| a |
| 6 |
| 3x |
| x-4y |
| x+y |
| 4y-x |
| 7y |
| x-4y |
=
| 3x-x-y-7y |
| x-4y |
=
| 2(x-4y) |
| x-4y |
=2．
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