题目内容
脱式计算,能简算的要简算.
3-
-
+
+
-
+
-
.
3-
| 3 |
| 10 |
| 7 |
| 10 |
| 6 |
| 7 |
| 1 |
| 13 |
| 2 |
| 13 |
| 6 |
| 7 |
| 2 |
| 3 |
| 1 |
| 2 |
| 5 |
| 6 |
分析:(1)根据连续减去两个数,等于减去这两个数的和简算;
(2)运用加法结合律简算;
(3)按照从左到右的顺序计算.
(2)运用加法结合律简算;
(3)按照从左到右的顺序计算.
解答:解:(1)3-
-
,
=3-(
+
),
=3-1,
=2;
(2)
+
+
-
,
=(
-
)+(
+
),
=0+
,
=
;
(3)
+
-
,
=
-
,
=
.
| 3 |
| 10 |
| 7 |
| 10 |
=3-(
| 3 |
| 10 |
| 7 |
| 10 |
=3-1,
=2;
(2)
| 6 |
| 7 |
| 1 |
| 13 |
| 2 |
| 13 |
| 6 |
| 7 |
=(
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 13 |
| 2 |
| 13 |
=0+
| 3 |
| 13 |
=
| 3 |
| 13 |
(3)
| 2 |
| 3 |
| 1 |
| 2 |
| 5 |
| 6 |
=
| 7 |
| 6 |
| 5 |
| 6 |
=
| 1 |
| 3 |
点评:本题考查了基本的分数加减运算,要注意分析数据,选择合适的简算方法简算.
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