题目内容
怎样算简便就怎样算．
| 56×(
|
| (
|
（1）
×（
+
）
=
×
+
×
=
+
=
；
（2）56×（
-
）
=56×
-56×
=24-21
=3；
（3）
×26+25×
=
×（26+25）
=
×51
=39；
（4）（
×
+
×
）÷
=（
+
）×
×
=1×（
×
）
=1×1
=1．
| 8 |
| 9 |
| 1 |
| 4 |
| 5 |
| 8 |
=
| 8 |
| 9 |
| 1 |
| 4 |
| 8 |
| 9 |
| 5 |
| 8 |
=
| 2 |
| 9 |
| 5 |
| 9 |
=
| 7 |
| 9 |
（2）56×（
| 3 |
| 7 |
| 3 |
| 8 |
=56×
| 3 |
| 7 |
| 3 |
| 8 |
=24-21
=3；
（3）
| 13 |
| 17 |
| 13 |
| 17 |
=
| 13 |
| 17 |
=
| 13 |
| 17 |
=39；
（4）（
| 11 |
| 15 |
| 3 |
| 5 |
| 3 |
| 5 |
| 4 |
| 15 |
| 3 |
| 5 |
=（
| 11 |
| 15 |
| 4 |
| 15 |
| 3 |
| 5 |
| 5 |
| 3 |
=1×（
| 3 |
| 5 |
| 5 |
| 3 |
=1×1
=1．
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