题目内容
计算.
|
6-(
| ||||||||||||||
|
| ||||||||||||||
|
1-(
|
分析:(1)先通分,再按照从左到右的顺序计算;
(2)(3)(4)先算小括号里面的,再算括号外的;
(5)根据加法交换律和结合律简算;
(6)根据减法的性质以及加法结合律简算.
(2)(3)(4)先算小括号里面的,再算括号外的;
(5)根据加法交换律和结合律简算;
(6)根据减法的性质以及加法结合律简算.
解答:解:(1)
+
+
=
+
+
=
;
(2)6-(
-
)
=6-
=5
;
(3)
-(
+
)
=
-
=
-
=
;
(4)
+(
-
)
=
+
=
+
=
;
(5)
+
+
+
=(
+
)+(
+
)
=1+1
=2;
(6)1-(
-
)+
=1-
+
+
=(1+
)+(
-
)
=1
+0
=1
.
| 4 |
| 5 |
| 11 |
| 15 |
| 3 |
| 10 |
=
| 48 |
| 60 |
| 44 |
| 60 |
| 18 |
| 60 |
=
| 11 |
| 6 |
(2)6-(
| 3 |
| 4 |
| 3 |
| 5 |
=6-
| 3 |
| 20 |
=5
| 17 |
| 20 |
(3)
| 4 |
| 3 |
| 2 |
| 5 |
| 3 |
| 10 |
=
| 4 |
| 3 |
| 7 |
| 10 |
=
| 40 |
| 30 |
| 21 |
| 30 |
=
| 19 |
| 30 |
(4)
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 2 |
=
| 5 |
| 9 |
| 1 |
| 4 |
=
| 20 |
| 36 |
| 9 |
| 36 |
=
| 29 |
| 30 |
(5)
| 2 |
| 3 |
| 7 |
| 10 |
| 1 |
| 3 |
| 3 |
| 10 |
=(
| 2 |
| 3 |
| 1 |
| 3 |
| 7 |
| 10 |
| 3 |
| 10 |
=1+1
=2;
(6)1-(
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 6 |
=1-
| 1 |
| 6 |
| 1 |
| 7 |
| 1 |
| 6 |
=(1+
| 1 |
| 7 |
| 1 |
| 6 |
| 1 |
| 6 |
=1
| 1 |
| 7 |
=1
| 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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