题目内容
1
×(2
-
)+17
÷
.
| 4 |
| 17 |
| 2 |
| 3 |
| 3 |
| 4 |
| 11 |
| 12 |
| 17 |
| 21 |
分析:先算出小括号里面的减法,再运用乘法分配律简算.
解答:解:1
×(2
-
)+17
÷
,
=
×
+
×
,
=
×(
+
),
=
×
,
=
.
| 4 |
| 17 |
| 2 |
| 3 |
| 3 |
| 4 |
| 11 |
| 12 |
| 17 |
| 21 |
=
| 21 |
| 17 |
| 23 |
| 12 |
| 215 |
| 12 |
| 21 |
| 17 |
=
| 21 |
| 17 |
| 23 |
| 12 |
| 215 |
| 12 |
=
| 21 |
| 17 |
| 238 |
| 12 |
=
| 49 |
| 2 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用运算定律进行简便计算.
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