题目内容

计算下面各题.(能简便的就简便)
7
15
×14+
7
15
7
12
+
1
24
÷
1
2
9
28
×14×
4
9
12÷
5
6
×
5
12
14
5
÷
2
5
÷
1
7
1
4
÷
5
6
×
5
12
5
14
+
5
7
÷
6
7
1
3
×
4
5
-
5
7
分析:(1)(2)(7)运用乘法分配律解答,
(3)(4)运用乘法交换律解答,
(5)运用除法性质即可解答,
(6)按照从左到右顺序计算即可解答,
(8)按照先算括号里面的,再算括号外面的顺序计算即可解答.
解答:解:(1)
7
15
×14+
7
15

=
7
15
×(14+1)
=
7
15
×15
=7;

(2)(
7
12
+
1
24
÷
1
2

=
7
12
×
2+
1
24
×
2
=
7
6
+
1
12

=1
1
4


(3)
9
28
×
14×
4
9

=
9
28
×
4
9
×14
=
1
7
×
14
=2;

(4)12÷
5
6
×
5
12

=12×
5
12
÷
5
6

=5÷
5
6

=6;

(5)
14
5
÷
2
5
÷
1
7

=
14
5
÷(
2
5
×
1
7

=
14
5
÷
2
35

=49;

(6)
1
4
÷
5
6
×
5
12

=
3
10
×
5
12

=
1
8


(7)(
5
14
+
5
7
÷
6
7

=
15
14
÷
6
7

=1
1
4


(8)
1
3
×
4
5
-
5
7

=
1
3
×
3
35

=
1
35
点评:本题考查知识点:(1)正确运用简便方法解决问题,(2)依据四则运算计算方法正确进行计算.
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