题目内容
计算下面各题.
(1)
×
×
(2)
×
×15
(3)15×
×
.
(1)
| 4 |
| 7 |
| 21 |
| 10 |
| 2 |
| 5 |
(2)
| 3 |
| 5 |
| 2 |
| 9 |
(3)15×
| 9 |
| 10 |
| 3 |
| 5 |
(1)
×
×
=
×
=
;
(2)
×
×15
=
×15
=2;
(3)15×
×
=
×
=
.
| 4 |
| 7 |
| 21 |
| 10 |
| 2 |
| 5 |
=
| 6 |
| 5 |
| 2 |
| 5 |
=
| 12 |
| 25 |
(2)
| 3 |
| 5 |
| 2 |
| 9 |
=
| 2 |
| 15 |
=2;
(3)15×
| 9 |
| 10 |
| 3 |
| 5 |
=
| 27 |
| 2 |
| 3 |
| 5 |
=
| 81 |
| 10 |
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