题目内容
计算:(12
+7
)÷(24
+14
)
| 4 |
| 9 |
| 5 |
| 13 |
| 8 |
| 9 |
| 10 |
| 13 |
考点:分数的四则混合运算
专题:运算顺序及法则
分析:观察算式发现:24
+14
=(12
+7
)×2,所以原式就变为:(12
+7
)÷[(12
+7
)×2],运用除法的性质简算即可.
| 8 |
| 9 |
| 10 |
| 13 |
| 4 |
| 9 |
| 5 |
| 13 |
| 4 |
| 9 |
| 5 |
| 13 |
| 4 |
| 9 |
| 5 |
| 13 |
解答:
解:(12
+7
)÷(24
+14
)
=(12
+7
)÷[(12
+7
)×2]
=(12
+7
)÷(12
+7
)÷2
=1÷2
=
| 4 |
| 9 |
| 5 |
| 13 |
| 8 |
| 9 |
| 10 |
| 13 |
=(12
| 4 |
| 9 |
| 5 |
| 13 |
| 4 |
| 9 |
| 5 |
| 13 |
=(12
| 4 |
| 9 |
| 5 |
| 13 |
| 4 |
| 9 |
| 5 |
| 13 |
=1÷2
=
| 1 |
| 2 |
点评:本题数据较大,若按运算顺序计算比较麻烦,由算式特点运用一些运算性质、定律简算比较简便.
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