题目内容
能简算的要简便计算.
6-
-
-
+
-
-(
-
)
6-
| 3 |
| 11 |
| 8 |
| 11 |
| 11 |
| 14 |
| 3 |
| 5 |
| 3 |
| 14 |
| 2 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
分析:整数的加法交换律、结合律和减法的运算性质在分数加法中同样适用.并能应用运算定律和性质,进行一些简便计算.
解答:解:6-
-
,
=6-(
+
),
=6-1,
=5;
-
+
-
,
=(
+
)-(
+
),
=1-1,
=0;
-(
-
),
=(
+
)-
,
=1-
,
=
.
| 3 |
| 11 |
| 8 |
| 11 |
=6-(
| 3 |
| 11 |
| 8 |
| 11 |
=6-1,
=5;
| 11 |
| 14 |
| 3 |
| 5 |
| 3 |
| 14 |
| 2 |
| 5 |
=(
| 11 |
| 14 |
| 3 |
| 14 |
| 3 |
| 5 |
| 2 |
| 5 |
=1-1,
=0;
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 5 |
=1-
| 2 |
| 5 |
=
| 3 |
| 5 |
点评:此题考查了分数的简便计算.
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