题目内容
简便计算：
|
|
（r）
-
-
=
-（
+
）
=
-r
=
；
（九）
×
+
÷
=
×
+
×
=（
+
）×
=r×
=
．
| 7 |
| 少 |
| 5 |
| r九 |
| 7 |
| r九 |
=
| 7 |
| 少 |
| 5 |
| r九 |
| 7 |
| r九 |
=
| 7 |
| 少 |
=
| d |
| 少 |
（九）
| 8 |
| rr |
| 5 |
| t |
| 5 |
| t |
| rr |
| d |
=
| 8 |
| rr |
| 5 |
| t |
| 5 |
| t |
| d |
| rr |
=（
| 8 |
| rr |
| d |
| rr |
| 5 |
| t |
=r×
| 5 |
| t |
=
| 5 |
| t |
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