题目内容
(2012?陆良县模拟)1
-
×1
-
=1×1=1
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 6 |
×
×
.分析:根据分数四则混合运算的顺序,本题中应先算乘后算减,由此可判断正误.
解答:解:根据分数四则混合运算的顺序,本题中应先算乘后算减,
1
-
×1
-
,
=
-
×
-
,
=
-
-
,
=
-(
+
),
=
-
,
=
,
所以上面的做法是错误的.
故答案为:×.
1
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 6 |
=
| 4 |
| 3 |
| 1 |
| 3 |
| 7 |
| 6 |
| 1 |
| 6 |
=
| 4 |
| 3 |
| 7 |
| 18 |
| 1 |
| 6 |
=
| 4 |
| 3 |
| 7 |
| 18 |
| 1 |
| 6 |
=
| 4 |
| 3 |
| 5 |
| 9 |
=
| 7 |
| 9 |
所以上面的做法是错误的.
故答案为:×.
点评:此题考查了分数四则混合运算的顺序,先算乘除后算加减.
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