早教吧 育儿知识 作业答案 考试题库 百科 知识分享

计算尽量用简便方法(1)32.5+3.6×2.5÷0.48(2)22-34×12-58(3)299÷(299+299300)(4)[138-(58+57)]×34.

题目详情
计算尽量用简便方法
(1)32.5+3.6×2.5÷0.48
(2)22-
3
4
×
1
2
-
5
8

(3)299÷(299+
299
300

(4)[
13
8
-(
5
8
+
5
7
)]×
3
4
▼优质解答
答案和解析
(1)32.5+3.6×2.5÷0.48,
=32.5+9÷0.48,
=32.5+18.75,
=51.25;
(2)22-
3
4
×
1
2
-
5
8

=22-
3
8
-
5
8

=22-(
3
8
+
5
8
),
=22-1,
=21;
(3)299÷(299+
299
300
),
=299÷
299×300+299
300

=299×
300
299×300+299

=
300
300+1

=
300
301

(4)[
13
8
-(
5
8
+
5
7
)]×
3
4

=[
13
8
-
5
8
-
5
7
3
4

=[1-
5
7
3
4

=
2
7
×
3
4

=
3
14