题目内容
| 计算 ①
|
②25×
|
③
| ||||||||||||||||
④
|
⑤
|
⑥15÷
|
分析:①通分计算;
②③约分计算;
④⑤⑥把除法改为乘法,约分计算.
②③约分计算;
④⑤⑥把除法改为乘法,约分计算.
解答:解:①
+
-
,
=
+
-
,
=
;
②25×
×
=
;
③
×
×
=
;
④
÷6÷
=
×
×15,
=
;
⑤
×
÷
,
=
×
×
,
=
;
⑥15÷
×
,
=15×
×
,
=
.
| 1 |
| 6 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 2 |
| 12 |
| 3 |
| 12 |
| 4 |
| 12 |
=
| 1 |
| 12 |
②25×
| 2 |
| 27 |
| 3 |
| 5 |
| 10 |
| 9 |
③
| 3 |
| 4 |
| 8 |
| 15 |
| 10 |
| 13 |
| 4 |
| 13 |
④
| 3 |
| 5 |
| 1 |
| 15 |
=
| 3 |
| 5 |
| 1 |
| 6 |
=
| 3 |
| 2 |
⑤
| 9 |
| 5 |
| 2 |
| 3 |
| 18 |
| 35 |
=
| 9 |
| 5 |
| 2 |
| 3 |
| 35 |
| 18 |
=
| 7 |
| 3 |
⑥15÷
| 9 |
| 25 |
| 4 |
| 5 |
=15×
| 25 |
| 9 |
| 4 |
| 5 |
=
| 100 |
| 3 |
点评:本题考查了学生通过通分和约分对分数四则混合运题目进行简算的能力.
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