题目内容
9
×
+14
÷
+18
÷4-21
×1
= ．
| 1 |
| 3 |
| 3 |
| 5 |
| 7 |
| 8 |
| 7 |
| 12 |
| 2 |
| 5 |
| 5 |
| 6 |
| 1 |
| 2 |
考点：分数的四则混合运算
专题：运算顺序及法则
分析：先算乘法和除法，再根据加法交换律进行简算．
解答：
解：9
×
+14
÷
+18
÷4-21
×1
=5
+25
+4
-32
=5
+4
+25
-32
=10
+25
-32
=35
-32
=2
．
故答案为：2
．
| 1 |
| 3 |
| 3 |
| 5 |
| 7 |
| 8 |
| 7 |
| 12 |
| 2 |
| 5 |
| 5 |
| 6 |
| 1 |
| 2 |
=5
| 3 |
| 5 |
| 1 |
| 2 |
| 3 |
| 5 |
| 3 |
| 4 |
=5
| 3 |
| 5 |
| 3 |
| 5 |
| 1 |
| 2 |
| 3 |
| 4 |
=10
| 1 |
| 5 |
| 1 |
| 2 |
| 3 |
| 4 |
=35
| 7 |
| 10 |
| 3 |
| 4 |
=2
| 19 |
| 20 |
故答案为：2
| 19 |
| 20 |
点评：考查了运算定律与简便运算，四则混合运算．注意运算顺序和运算法则，灵活运用所学的运算定律简便计算．
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