题目内容
计算下列各题,能简便的简便计算
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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)根据加法交换律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律进行简算;
(5)按照从左向右的顺序进行计算;
(6)按照从左向右的顺序进行计算.
(2)根据加法交换律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律进行简算;
(5)按照从左向右的顺序进行计算;
(6)按照从左向右的顺序进行计算.
解答:
解:(1)
-
+
=
+
=
;
(2)
+
+
=
+
+
=1+
=1
;
(3)1-
+
=
+
=
;
(4)
+
+
=
+
+
=1+
=1
;
(5)
+
-
=
-
=1;
(6)
-
+
=
+
=
.
2 |
5 |
1 |
6 |
2 |
3 |
=
7 |
30 |
2 |
3 |
=
9 |
10 |
(2)
4 |
9 |
3 |
4 |
5 |
9 |
=
4 |
9 |
5 |
9 |
3 |
4 |
=1+
3 |
4 |
=1
3 |
4 |
(3)1-
1 |
4 |
2 |
5 |
=
3 |
4 |
2 |
5 |
=
23 |
20 |
(4)
7 |
8 |
2 |
7 |
1 |
8 |
=
7 |
8 |
1 |
8 |
2 |
7 |
=1+
2 |
7 |
=1
2 |
7 |
(5)
1 |
2 |
5 |
6 |
1 |
3 |
=
4 |
3 |
1 |
3 |
=1;
(6)
8 |
9 |
5 |
9 |
1 |
6 |
=
1 |
3 |
1 |
6 |
=
1 |
2 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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