题目内容

递等式计算.
 (1)7000÷25-28×6
(2)(289-179)÷(275÷25)
(3)
1
8
+
3
8
+
2
8
(4)
10
11
-
7
11
-
1
11
(5)
3
14
+
5
14
-
4
14
(6)
12
25
-
4
25
+
9
25
(7)
7
9
+
2
9
-
31
74
(8)
5
14
-
7
14
+
6
14
分析:(1)先算乘法和除法,再算减法;
(2)先算两个小括号里面的减法和除法,再算括号外的除法;
(3)(4)(5)(6)(7)按照从左到右的顺序计算;
(8)运用加法交换律进行计算.
解答:解:(1)7000÷25-28×6,
=280-168,
=112;

(2)(289-179)÷(275÷25),
=110÷11,
=10;

(3)
1
8
+
3
8
+
2
8

=
4
8
+
2
8

=
6
8

=
3
4


(4)
10
11
-
7
11
-
1
11

=
3
11
-
1
11

=
2
11


(5)
3
14
+
5
14
-
4
14

=
8
14
-
4
14

=
4
14

=
2
7


(6)
12
25
-
4
25
+
9
25

=
8
25
+
9
25

=
17
25


(7)
7
9
+
2
9
-
31
74

=1-
31
74

=
43
74


(8)
5
14
-
7
14
+
6
14

=
5
14
+
6
14
-
7
14

=
11
14
-
7
14

=
4
14

=
2
7
点评:本题考查了简单的混合运算,计算时先理清楚运算顺序,根据运算顺序逐步求解即可.
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