题目内容
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分析:(1)--(5)题,把除法变为乘法,约分计算;
(6)题,先算括号内的,再算括号外的.
(6)题,先算括号内的,再算括号外的.
解答:解:(1)
÷21
=
×
=
(2)
÷
=
×
=
(3)
÷
=
×
=
(4)
×
÷
=
×
×
=
(5)
÷5×
=
×
×
=
(6)
÷(
-
)
=
÷
=
×
=6
| 14 |
| 11 |
=
| 14 |
| 11 |
| 1 |
| 21 |
=
| 2 |
| 33 |
(2)
| 5 |
| 8 |
| 5 |
| 6 |
=
| 5 |
| 8 |
| 6 |
| 5 |
=
| 3 |
| 4 |
(3)
| 8 |
| 9 |
| 3 |
| 7 |
=
| 8 |
| 9 |
| 7 |
| 3 |
=
| 56 |
| 27 |
(4)
| 9 |
| 46 |
| 11 |
| 12 |
| 22 |
| 23 |
=
| 9 |
| 46 |
| 11 |
| 12 |
| 23 |
| 22 |
=
| 3 |
| 16 |
(5)
| 40 |
| 7 |
| 5 |
| 2 |
=
| 40 |
| 7 |
| 1 |
| 5 |
| 5 |
| 2 |
=
| 20 |
| 7 |
(6)
| 8 |
| 5 |
| 3 |
| 5 |
| 1 |
| 3 |
=
| 8 |
| 5 |
| 4 |
| 15 |
=
| 8 |
| 5 |
| 15 |
| 4 |
=6
点评:此题主要考查分数计算中乘除法的转化,以及运用约分进行简算.
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