题目内容
用简便方法计算下面各题．
|
|
| 15×
|
（1）
×
+
×
=（
+
）×
=1×
=
；
（2）
×7+11÷
=
×7+11×
=
×（7+11）
=
×18
=10；
（3）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
；
（4）15×
-
=（15-1）×
=14×
=12．
| 2 |
| 7 |
| 4 |
| 5 |
| 5 |
| 7 |
| 4 |
| 5 |
=（
| 2 |
| 7 |
| 5 |
| 7 |
| 4 |
| 5 |
=1×
| 4 |
| 5 |
=
| 4 |
| 5 |
（2）
| 5 |
| 9 |
| 9 |
| 5 |
=
| 5 |
| 9 |
| 5 |
| 9 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
=10；
（3）
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（4）15×
| 6 |
| 7 |
| 6 |
| 7 |
=（15-1）×
| 6 |
| 7 |
=14×
| 6 |
| 7 |
=12．
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