题目内容
简便计算．
| (3×
|
| ||||||||||||||||||||||||
14×
| (
|
（1）
×
+
×
=
×（
+
）
=
×
=
；
（2）（3×
）×4
×
×
=3×
×
×
×
=
；
（3）
×
+
×
=（
+
）×
=1×
=
；
（4）14×
-
=（14-1）×
=13×
=7；
（5）（
+
）×12
=
×12+
×12
=4+3
=7．
| 4 |
| 5 |
| 3 |
| 8 |
| 4 |
| 5 |
| 1 |
| 2 |
=
| 4 |
| 5 |
| 3 |
| 8 |
| 1 |
| 2 |
=
| 4 |
| 5 |
| 7 |
| 8 |
=
| 7 |
| 10 |
（2）（3×
| 5 |
| 12 |
| 3 |
| 7 |
| 2 |
| 9 |
| 7 |
| 8 |
=3×
| 5 |
| 12 |
| 31 |
| 7 |
| 2 |
| 9 |
| 7 |
| 8 |
=
| 155 |
| 144 |
（3）
| 4 |
| 9 |
| 2 |
| 3 |
| 2 |
| 3 |
| 5 |
| 9 |
=（
| 4 |
| 9 |
| 5 |
| 9 |
| 2 |
| 3 |
=1×
| 2 |
| 3 |
=
| 2 |
| 3 |
（4）14×
| 7 |
| 13 |
| 7 |
| 13 |
=（14-1）×
| 7 |
| 13 |
=13×
| 7 |
| 13 |
=7；
（5）（
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 1 |
| 4 |
=4+3
=7．
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