题目内容
| 计算: 1-
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考点:分数的加法和减法
专题:运算顺序及法则
分析:(1)按照从左向右的顺序进行计算;
(2)根据加法交换律和结合律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据减法的性质进行简算;
(5)根据加法结合律进行简算;
(6)根据减法的性质以及加法交换律进行简算.
(2)根据加法交换律和结合律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据减法的性质进行简算;
(5)根据加法结合律进行简算;
(6)根据减法的性质以及加法交换律进行简算.
解答:
解:(1)1-
-
=
-
=
;
(2)
+
+
-
=(
+
)+(
-
)
=1+
=1
;
(3)
+
+
=
+
=
;
(4)
-
-
=
-(
+
)
=
-
=
;
(5)
+
+
=
+(
+
)
=
+1
=1
;
(6)
-(
-
)
=
-
+
=
+
-
=
-
=
.
| 1 |
| 6 |
| 1 |
| 3 |
=
| 5 |
| 6 |
| 1 |
| 3 |
=
| 1 |
| 2 |
(2)
| 5 |
| 12 |
| 7 |
| 15 |
| 7 |
| 12 |
| 2 |
| 15 |
=(
| 5 |
| 12 |
| 7 |
| 12 |
| 7 |
| 15 |
| 2 |
| 15 |
=1+
| 1 |
| 3 |
=1
| 1 |
| 3 |
(3)
| 3 |
| 8 |
| 1 |
| 12 |
| 9 |
| 24 |
=
| 11 |
| 24 |
| 9 |
| 24 |
=
| 5 |
| 6 |
(4)
| 27 |
| 50 |
| 3 |
| 25 |
| 2 |
| 25 |
=
| 27 |
| 50 |
| 3 |
| 25 |
| 2 |
| 25 |
=
| 27 |
| 50 |
| 1 |
| 5 |
=
| 17 |
| 50 |
(5)
| 3 |
| 10 |
| 5 |
| 12 |
| 7 |
| 12 |
=
| 3 |
| 10 |
| 5 |
| 12 |
| 7 |
| 12 |
=
| 3 |
| 10 |
=1
| 3 |
| 10 |
(6)
| 11 |
| 18 |
| 5 |
| 6 |
| 5 |
| 18 |
=
| 11 |
| 18 |
| 5 |
| 6 |
| 5 |
| 18 |
=
| 11 |
| 18 |
| 5 |
| 18 |
| 5 |
| 6 |
=
| 8 |
| 9 |
| 5 |
| 6 |
=
| 1 |
| 18 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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