题目内容
下面各题怎样算简便就怎样算.
6-
-
-
+
-
-
+
+
-
.
6-
| 3 |
| 11 |
| 8 |
| 11 |
| 5 |
| 7 |
| 3 |
| 10 |
| 3 |
| 7 |
| 7 |
| 10 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 4 |
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
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)运用加法结合律以及根据连续减去两个数,等于减去这两个数的和简算;
(3)(4)运用加法交换律简算.
(2)运用加法结合律以及根据连续减去两个数,等于减去这两个数的和简算;
(3)(4)运用加法交换律简算.
解答:解:(1)6-
-
,
=6-(
+
),
=6-1,
=5;
(2)
-
+
-
,
=(
+
)-(
+
),
=
-1,
=
;
(3)
-
+
,
=
+
-
,
=
-
,
=
;
(4)
+
-
,
=
-
+
,
=0+
,
=
.
| 3 |
| 11 |
| 8 |
| 11 |
=6-(
| 3 |
| 11 |
| 8 |
| 11 |
=6-1,
=5;
(2)
| 5 |
| 7 |
| 3 |
| 10 |
| 3 |
| 7 |
| 7 |
| 10 |
=(
| 5 |
| 7 |
| 3 |
| 7 |
| 3 |
| 10 |
| 7 |
| 10 |
=
| 8 |
| 7 |
=
| 1 |
| 7 |
(3)
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 7 |
| 12 |
| 1 |
| 2 |
=
| 1 |
| 12 |
(4)
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
=
| 5 |
| 9 |
| 5 |
| 9 |
| 3 |
| 4 |
=0+
| 3 |
| 4 |
=
| 3 |
| 4 |
点评:本题考查了基本的分数加减法的运算,要注意分析数据,选择合适的简算方法计算.
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