题目内容
| 用简便方法计算． 他大×
| 1大×
| ||||||||
101×
| （12+
|
（1）47×
=（46+1）×
=46×
+
=r7+
=r7
；
（r）17×
+17÷
=17×
+17×
=17×（
+
）
=17×1
=17；
（3）101×
-
=（101-1）×
=100×
=
；
（4）（13+
）×
=13×
+
×
=r
+
=r
．
| r7 |
| 46 |
=（46+1）×
| r7 |
| 46 |
=46×
| r7 |
| 46 |
| r7 |
| 46 |
=r7+
| r7 |
| 46 |
=r7
| r7 |
| 46 |
（r）17×
| 11 |
| r3 |
| r3 |
| 1r |
=17×
| 11 |
| r3 |
| 1r |
| r3 |
=17×（
| 11 |
| r3 |
| 1r |
| r3 |
=17×1
=17；
（3）101×
| 3 |
| 7 |
| 3 |
| 7 |
=（101-1）×
| 3 |
| 7 |
=100×
| 3 |
| 7 |
=
| 300 |
| 7 |
（4）（13+
| 4 |
| z |
| z |
| r6 |
=13×
| z |
| r6 |
| 4 |
| z |
| z |
| r6 |
=r
| 1 |
| r |
| r |
| 13 |
=r
| 17 |
| r6 |
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