题目内容
4
-2
+5
-3
+12
.
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 9 |
| 7 |
| 18 |
| 5 |
| 36 |
分析:先把带分数化成整数部分加上一个真分数的形式,再运用加法结合律简算.
解答:解:4
-2
+5
-3
+12
,
=(4+
)-(2+
)+(5+
)-(3+
)+(12+
),
=4+
-2-
+5+
-3-
+12+
,
=(4-2+5-3+12)+(
-
+
-
+
),
=(4-2+5-3+12)+(
-
+
-
+
),
=16+
,
=16
.
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 9 |
| 7 |
| 18 |
| 5 |
| 36 |
=(4+
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 9 |
| 7 |
| 18 |
| 5 |
| 36 |
=4+
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 9 |
| 7 |
| 18 |
| 5 |
| 36 |
=(4-2+5-3+12)+(
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 9 |
| 7 |
| 18 |
| 5 |
| 36 |
=(4-2+5-3+12)+(
| 12 |
| 36 |
| 6 |
| 36 |
| 4 |
| 36 |
| 14 |
| 36 |
| 5 |
| 36 |
=16+
| 1 |
| 36 |
=16
| 1 |
| 36 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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