题目内容
计算:20÷20
+
=______.
| 20 |
| 21 |
| 1 |
| 22 |
20÷20
+
,
=20÷
+
,
=20×
+
,
=20×
+
,
=
+
,
=1.
| 20 |
| 21 |
| 1 |
| 22 |
=20÷
| 20×21+20 |
| 21 |
| 1 |
| 22 |
=20×
| 21 |
| 20×(21+1) |
| 1 |
| 22 |
=20×
| 21 |
| 20×22 |
| 1 |
| 22 |
=
| 21 |
| 22 |
| 1 |
| 22 |
=1.
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