题目内容
计算:
×
+
÷
×
.
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 3 |
| 2 |
| 5 |
| 5 |
| 7 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:把除法变为乘法,运用乘法分配律计算,然后运用乘法结合律简算.
解答:
解:
×
+
÷
×
=
×
+
×
×
=
×
+
×
×
=
×
×(1+
)
=
×(
×
)
=
×
=
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 3 |
| 2 |
| 5 |
| 5 |
| 7 |
=
| 5 |
| 6 |
| 2 |
| 7 |
| 1 |
| 3 |
| 5 |
| 2 |
| 5 |
| 7 |
=
| 2 |
| 6 |
| 5 |
| 7 |
| 1 |
| 3 |
| 5 |
| 2 |
| 5 |
| 7 |
=
| 1 |
| 3 |
| 5 |
| 7 |
| 5 |
| 2 |
=
| 1 |
| 3 |
| 5 |
| 7 |
| 7 |
| 2 |
=
| 1 |
| 3 |
| 5 |
| 2 |
=
| 5 |
| 6 |
点评:本题考查了学生通过约分对分数四则混合运题目进行简算的能力.
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