题目内容
| 7 |
| 8 |
| 4 |
| 7 |
| 7 |
| 8 |
| 21 |
| 32 |
| 7 |
| 8 |
| 13 |
| 27 |
| 19 |
| 27 |
（1）
×
×8
=（
×8）×
=7×
=4；
（2）（
-
）÷
=
÷
-
÷
=1-
×
=1-
=
；
（3）
×8+
×13
=
×8+
×19
=
×（8+19）
=
×27
=13．
| 7 |
| 8 |
| 4 |
| 7 |
=（
| 7 |
| 8 |
| 4 |
| 7 |
=7×
| 4 |
| 7 |
=4；
（2）（
| 7 |
| 8 |
| 21 |
| 32 |
| 7 |
| 8 |
=
| 7 |
| 8 |
| 7 |
| 8 |
| 21 |
| 32 |
| 7 |
| 8 |
=1-
| 21 |
| 32 |
| 8 |
| 7 |
=1-
| 3 |
| 4 |
=
| 1 |
| 4 |
（3）
| 13 |
| 27 |
| 19 |
| 27 |
=
| 13 |
| 27 |
| 13 |
| 27 |
=
| 13 |
| 27 |
=
| 13 |
| 27 |
=13．
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