题目内容
计算.
|
|
|
|
(1)
×
×
=
×
×
=
×
=
;
(2)
×
×9
=
×9×
=2×
=
;
(3)
×
×
=
×
×
=
×
=
;
(4)
×
×
=
×(
×
)
=
×
=
.
| 5 |
| 7 |
| 2 |
| 3 |
| 14 |
| 15 |
=
| 5 |
| 7 |
| 14 |
| 15 |
| 2 |
| 3 |
=
| 2 |
| 3 |
| 2 |
| 3 |
=
| 4 |
| 9 |
(2)
| 2 |
| 9 |
| 3 |
| 20 |
=
| 2 |
| 9 |
| 3 |
| 20 |
=2×
| 3 |
| 20 |
=
| 3 |
| 10 |
(3)
| 7 |
| 12 |
| 3 |
| 4 |
| 2 |
| 21 |
=
| 7 |
| 12 |
| 2 |
| 21 |
| 3 |
| 4 |
=
| 1 |
| 18 |
| 3 |
| 4 |
=
| 1 |
| 24 |
(4)
| 6 |
| 7 |
| 2 |
| 15 |
| 5 |
| 8 |
=
| 6 |
| 7 |
| 2 |
| 15 |
| 5 |
| 8 |
=
| 6 |
| 7 |
| 1 |
| 12 |
=
| 1 |
| 14 |
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