题目内容
计算下面各题,能简算的要简算.
-
+
5-
-
+
+
+
-
+
.
| 5 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
| 4 |
| 7 |
| 3 |
| 7 |
| 4 |
| 9 |
| 3 |
| 10 |
| 5 |
| 9 |
| 7 |
| 10 |
| 8 |
| 9 |
| 5 |
| 9 |
| 1 |
| 6 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)运用加法交换律简算;
(2)根据减法的性质简算;
(3)根据加法交换律和结合律简算;
(4)按照从左到右的顺序计算.
(2)根据减法的性质简算;
(3)根据加法交换律和结合律简算;
(4)按照从左到右的顺序计算.
解答:
解:(1)
-
+
=
+
-
=
-
=
;
(2)5-
-
=5-(
+
)
=5-1
=4;
(3)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(4)
-
+
=
+
=
.
| 5 |
| 6 |
| 3 |
| 4 |
| 2 |
| 3 |
=
| 5 |
| 6 |
| 2 |
| 3 |
| 3 |
| 4 |
=
| 3 |
| 2 |
| 3 |
| 4 |
=
| 3 |
| 4 |
(2)5-
| 4 |
| 7 |
| 3 |
| 7 |
=5-(
| 4 |
| 7 |
| 3 |
| 7 |
=5-1
=4;
(3)
| 4 |
| 9 |
| 3 |
| 10 |
| 5 |
| 9 |
| 7 |
| 10 |
=(
| 4 |
| 9 |
| 5 |
| 9 |
| 7 |
| 10 |
| 3 |
| 10 |
=1+1
=2;
(4)
| 8 |
| 9 |
| 5 |
| 9 |
| 1 |
| 6 |
=
| 1 |
| 3 |
| 1 |
| 6 |
=
| 1 |
| 2 |
点评:本题考查了基本的分数的加减混合运算,要注意分析数据,选择合适的简算方法简算.
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