题目内容
计算下面各题．
①12÷
|
②
|
③
|
④
|
①12÷
×
，
=12×
×
，
=
；
②
×
÷
，
=
×
×
，
=
；
③
÷
×
，
=
×
×
，
=
；
④
÷3÷
，
=
×
×
，
=
．
| 4 |
| 3 |
| 1 |
| 6 |
=12×
| 3 |
| 4 |
| 1 |
| 6 |
=
| 3 |
| 2 |
②
| 4 |
| 15 |
| 5 |
| 9 |
| 10 |
| 21 |
=
| 4 |
| 15 |
| 5 |
| 9 |
| 21 |
| 10 |
=
| 14 |
| 45 |
③
| 2 |
| 3 |
| 7 |
| 15 |
| 21 |
| 25 |
=
| 2 |
| 3 |
| 15 |
| 7 |
| 21 |
| 25 |
=
| 6 |
| 5 |
④
| 1 |
| 4 |
| 5 |
| 6 |
=
| 1 |
| 4 |
| 1 |
| 3 |
| 6 |
| 5 |
=
| 1 |
| 10 |
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