题目内容
(2013?华亭县模拟)
×
÷
×
=1
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
错误
错误
.(判断对错)分析:把
×
÷
×
中的除法变成乘法,再运用乘法结合律简算,计算出结果与1比较.
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
解答:解:
×
÷
×
,
=
×
×
×
,
=(
×
)×(
×
),
=1×
,
=
;
≠1;
故答案为:错误.
| 3 |
| 4 |
| 2 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
=
| 3 |
| 4 |
| 2 |
| 5 |
| 4 |
| 3 |
| 2 |
| 5 |
=(
| 3 |
| 4 |
| 4 |
| 3 |
| 2 |
| 5 |
| 2 |
| 5 |
=1×
| 4 |
| 25 |
=
| 4 |
| 25 |
| 4 |
| 25 |
故答案为:错误.
点评:解决本题要注意运算顺序,正确运用运算定律,不要被数字迷惑.
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