题目内容

计算题:
(1)0.125×7.37+
1
8
×3.63-12.5×0.1
(2)1
4
17
×(2
2
3
-
3
4
)+
11
12
÷
17
21

(3)(4
7
8
-
13
16
+26)÷
13
16
×
1
74

(4)246×
345345345345
123123123123
分析:(1)、(2)、(3)运用乘法分配律解答,
(4)化345345345345=345×1001001001,123123123123=123×1001001001解答.
解答:解:(1)0.125×7.37+
1
8
×3.63-12.5×0.1,
=0.125×(7.37+3.63-10),
=0.125×1,
=0.125;

(2)1
4
17
×(2
2
3
-
3
4
)+
11
12
÷
17
21

=
21
17
×
23
12
+
11
12
×
21
17

=
21
17
×(
23
12
+
11
12
),
=
21
17
×
34
12

=3.5;

(3))(4
7
8
-
13
16
+26)÷
13
16
×
1
74

=(
39
8
×
16
13
-
13
16
×
16
13
+26×
16
13
)×
1
74

=(6-1+32)×
1
74

=37×
1
74

=0.5;

(4)246×
345345345345
123123123123

=246×
1001001001×345
1001001001×123

=246×
345
123

=690.
点评:在计算题中正确的运用简便算法可以使计算更简单.
练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网