题目内容
1
×(2
-
)-
×
+
.
| 4 |
| 17 |
| 2 |
| 3 |
| 3 |
| 4 |
6
| ||||
3
|
| 13 |
| 33 |
17+
| ||
1-
|
考点:繁分数的化简
专题:计算问题(巧算速算)
分析:此题是一道分数四则运算的繁分数化简题,数据较多,所以计算时要细心观察,避免出错.先算括号内的以及繁分数的分子分母中的计算,然后根据分数四则混合运算的顺序进行.注意在计算过程中能约分要约分.
解答:
解:1
×(2
-
)-
×
+
=
×
-
×
+
=
×
-
×
+
×
=
×
-
×
+
×
=
×
-
×
+
×
=
×(
+
)-
=
×14-
=
-
=
| 4 |
| 17 |
| 2 |
| 3 |
| 3 |
| 4 |
6
| ||||
3
|
| 13 |
| 33 |
17+
| ||
1-
|
=
| 21 |
| 17 |
| 23 |
| 12 |
| ||||
|
| 13 |
| 33 |
| ||
|
=
| 21 |
| 17 |
| 23 |
| 12 |
48×(
| ||||
24×(
|
| 13 |
| 33 |
| 215 |
| 12 |
| 21 |
| 17 |
=
| 21 |
| 17 |
| 23 |
| 12 |
| ||
|
| 13 |
| 33 |
| 215 |
| 12 |
| 21 |
| 17 |
=
| 21 |
| 17 |
| 23 |
| 12 |
| 44 |
| 13 |
| 13 |
| 33 |
| 215 |
| 12 |
| 21 |
| 17 |
=
| 21 |
| 17 |
| 23 |
| 12 |
| 215 |
| 12 |
| 4 |
| 3 |
=
| 21 |
| 17 |
| 4 |
| 3 |
=
| 294 |
| 17 |
| 4 |
| 3 |
=
| 814 |
| 17 |
点评:繁分数的计算并不难,关键要掌握好分数运算的基本方法.如:分数的运算法则,约分的技巧及整除的性质等,这样就能化繁为简,很快地计算出来.
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