题目内容
| 5 |
| 9 |
| 16 |
| 17 |
| 1 |
| 9 |
| 1 |
| 9 |
| 5 |
| 17 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:通过观察,可把数字进行转化后,运用乘法分配律简算.
解答:
解:
×79
+50×
+
×
=
×
+50×
+
×
=
×(
×5+50+
)
=
×(
+50)
=
×(400+50)
=
×450
=50
| 5 |
| 9 |
| 16 |
| 17 |
| 1 |
| 9 |
| 1 |
| 9 |
| 5 |
| 17 |
=
| 5 |
| 9 |
| 1359 |
| 17 |
| 1 |
| 9 |
| 1 |
| 9 |
| 5 |
| 17 |
=
| 1 |
| 9 |
| 1359 |
| 17 |
| 5 |
| 17 |
=
| 1 |
| 9 |
| 6800 |
| 17 |
=
| 1 |
| 9 |
=
| 1 |
| 9 |
=50
点评:仔细观察数字,运用合适的简便方法计算.
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