题目内容
1
×（2
-
）-（6
-3
）÷（3
-2
）×
+17
÷
．
| 4 |
| 17 |
| 2 |
| 3 |
| 3 |
| 4 |
| 6 |
| 7 |
| 9 |
| 13 |
| 3 |
| 7 |
| 2 |
| 11 |
| 13 |
| 33 |
| 11 |
| 12 |
| 17 |
| 21 |
分析：此题算式较长，先计算每项的结果，然后运用加法交换律与结合律以及乘法分配律简算．
解答：解：1
×（2
-
）-（6
-3
）÷（3
-2
）×
+17
÷
=1
×（2-
）-（3+
）÷（1+
）×
+（17+
）÷
=
×
-
÷
×
+17÷
+
÷
=
×
-
×
×
+21+
×
=
×（
+
）-1+21
=
-1+21
=23.5．
| 4 |
| 17 |
| 2 |
| 3 |
| 3 |
| 4 |
| 6 |
| 7 |
| 9 |
| 13 |
| 3 |
| 7 |
| 2 |
| 11 |
| 13 |
| 33 |
| 11 |
| 12 |
| 17 |
| 21 |
=1
| 4 |
| 17 |
| 1 |
| 12 |
| 15 |
| 91 |
| 19 |
| 77 |
| 13 |
| 33 |
| 11 |
| 12 |
| 17 |
| 21 |
=
| 21 |
| 17 |
| 23 |
| 12 |
| 288 |
| 91 |
| 96 |
| 77 |
| 13 |
| 33 |
| 17 |
| 21 |
| 11 |
| 12 |
| 17 |
| 21 |
=
| 21 |
| 17 |
| 23 |
| 12 |
| 288 |
| 91 |
| 77 |
| 96 |
| 13 |
| 33 |
| 11 |
| 12 |
| 21 |
| 17 |
=
| 21 |
| 17 |
| 23 |
| 12 |
| 11 |
| 12 |
=
| 7 |
| 2 |
=23.5．
点评：仔细注意观察题目中数字构成的特点和规律，运用运算定律或运算技巧，进行简便计算．
练习册系列答案
相关题目