题目内容
计算下面各题(能简算的要简算)
|
|
|
8-
|
分析:(1)运用加法交换律简算;
(2)按照从左到右的顺序计算;
(3)先算小括号里面的减法,再算括号外的减法;
(4)根据减法的性质简算.
(2)按照从左到右的顺序计算;
(3)先算小括号里面的减法,再算括号外的减法;
(4)根据减法的性质简算.
解答:解:(1)
+
+
,
=
+
+
,
=1+
,
=1
;
(2)
+
-
,
=
-
,
=
;
(3)
-(
-
),
=
-
,
=
;
(4)8-
-
,
=8-(
+
),
=8-1,
=7.
| 4 |
| 7 |
| 5 |
| 9 |
| 3 |
| 7 |
=
| 4 |
| 7 |
| 3 |
| 7 |
| 5 |
| 9 |
=1+
| 5 |
| 9 |
=1
| 5 |
| 9 |
(2)
| 1 |
| 2 |
| 3 |
| 4 |
| 3 |
| 10 |
=
| 5 |
| 4 |
| 3 |
| 10 |
=
| 19 |
| 20 |
(3)
| 14 |
| 15 |
| 2 |
| 5 |
| 3 |
| 10 |
=
| 14 |
| 15 |
| 1 |
| 10 |
=
| 5 |
| 6 |
(4)8-
| 9 |
| 16 |
| 7 |
| 16 |
=8-(
| 9 |
| 16 |
| 7 |
| 16 |
=8-1,
=7.
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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