题目内容
递等式计算. (1)7000÷25-28×6 |
(2)(289-179)÷(275÷25) | ||||||||||||
(3)
|
(4)
| ||||||||||||
(5)
|
(6)
| ||||||||||||
(7)
|
(8)
|
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.
(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)
+
+
,
=
+
,
=
,
=
;
(4)
-
-
,
=
-
,
=
;
(5)
+
-
,
=
-
,
=
,
=
;
(6)
-
+
,
=
+
,
=
;
(7)
+
-
,
=1-
,
=
;
(8)
-
+
,
=
+
-
,
=
-
,
=
,
=
.
=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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