题目内容
计算:
(1)
×
=
;
(2)(-
)×(-
)=
;
(3)
÷(-
)
(4)(-
)÷
=
(1)
| 3 |
| 5 |
| 8 |
| 5 |
| 24 |
| 25 |
| 24 |
| 25 |
(2)(-
| 5 |
| 9 |
| 3 |
| 10 |
| 1 |
| 6 |
| 1 |
| 6 |
(3)
| 2 |
| 5 |
| 2 |
| 3 |
-
| 3 |
| 5 |
-
;| 3 |
| 5 |
(4)(-
| 3 |
| 8 |
| 2 |
| 7 |
-
| 21 |
| 16 |
-
.| 21 |
| 16 |
分析:原式各项利用分数的乘除法则计算即可得到结果.
解答:解:(1)原式=
=
;
(2)原式=
×
=
;
(3)原式=
×(-
)
=-
;
(4)原式=-
×
=-
.
故答案为:(1)
;(2)
;(3)-
;(4)-
.
| 3×8 |
| 5×5 |
=
| 24 |
| 25 |
(2)原式=
| 5 |
| 9 |
| 3 |
| 10 |
=
| 1 |
| 6 |
(3)原式=
| 2 |
| 5 |
| 3 |
| 2 |
=-
| 3 |
| 5 |
(4)原式=-
| 3 |
| 8 |
| 7 |
| 2 |
=-
| 21 |
| 16 |
故答案为:(1)
| 24 |
| 25 |
| 1 |
| 6 |
| 3 |
| 5 |
| 21 |
| 16 |
点评:此题考查了分式的乘除法,分式乘除法的关键是约分,约分的关键是找公因式.
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