题目内容
脱式计算.
(1)
| (2)
| (3)1-(
| ||||||||||||||||||
(4)
| (5)
| (6)
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)从左向右进行计算;
(2)运用加法的交换律进行简算;
(3)先算小括号里的加法,再算括号外的减法;
(4)先算减法,再算加法;
(5)从左向右进行计算;
(6)从左向右进行计算.
(2)运用加法的交换律进行简算;
(3)先算小括号里的加法,再算括号外的减法;
(4)先算减法,再算加法;
(5)从左向右进行计算;
(6)从左向右进行计算.
解答:
解:(1)
+
-
=
-
=
;
(2)
-
+
=
+
-
=1-
=
;
(3)1-(
+
)
=1-
=
;
(4)
+
-
=
-
+
=0+
=
;
(5)
-
+
=
+
=
;
(6)
-
-
=
-
=
.
3 |
5 |
17 |
20 |
1 |
4 |
=
29 |
20 |
1 |
4 |
=
6 |
5 |
(2)
8 |
9 |
2 |
3 |
1 |
9 |
=
8 |
9 |
1 |
9 |
2 |
3 |
=1-
2 |
3 |
=
1 |
3 |
(3)1-(
3 |
8 |
1 |
6 |
=1-
13 |
24 |
=
11 |
24 |
(4)
3 |
7 |
5 |
13 |
3 |
7 |
=
3 |
7 |
3 |
7 |
5 |
13 |
=0+
5 |
13 |
=
5 |
13 |
(5)
7 |
9 |
2 |
3 |
5 |
6 |
=
1 |
9 |
5 |
6 |
=
17 |
18 |
(6)
4 |
5 |
3 |
8 |
1 |
6 |
=
17 |
40 |
1 |
6 |
=
31 |
120 |
点评:考查了分数四则混合运算.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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