题目内容
列式计算.
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分析:(1)分子相乘的积做分子,分母相乘的积做分母;
(2)(3)(4)(5)(6)把除法变为乘法,约分计算.
(2)(3)(4)(5)(6)把除法变为乘法,约分计算.
解答:解:(1)
×
=
;
(2)
÷
,
=
×
,
=
;
(3)
÷
,
=
×
,
=
;
(4)
×
÷
,
=
×
×
,
=
;
(5)
÷
×
,
=
×
×
,
=
;
(6)
×
÷
,
=
×
×
,
=
.
| 8 |
| 15 |
| 4 |
| 5 |
| 32 |
| 75 |
(2)
| 5 |
| 9 |
| 5 |
| 12 |
=
| 5 |
| 9 |
| 12 |
| 5 |
=
| 4 |
| 3 |
(3)
| 7 |
| 18 |
| 5 |
| 3 |
=
| 7 |
| 18 |
| 3 |
| 5 |
=
| 7 |
| 30 |
(4)
| 7 |
| 12 |
| 6 |
| 35 |
| 2 |
| 7 |
=
| 7 |
| 12 |
| 6 |
| 35 |
| 7 |
| 2 |
=
| 7 |
| 20 |
(5)
| 3 |
| 40 |
| 9 |
| 20 |
| 6 |
| 17 |
=
| 3 |
| 40 |
| 20 |
| 9 |
| 6 |
| 17 |
=
| 1 |
| 17 |
(6)
| 3 |
| 8 |
| 5 |
| 7 |
| 15 |
| 16 |
=
| 3 |
| 8 |
| 5 |
| 7 |
| 16 |
| 15 |
=
| 2 |
| 7 |
点评:本题考查了学生通过约分对分数四则混合运题目进行简算的能力.
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