早教吧 育儿知识 作业答案 考试题库 百科 知识分享

脱式计算(能简算的要简算).85×0.75+15×75%57+59×32+163.68×[1÷(2.1-2.09)][(45-14)×611]÷920.

题目详情
脱式计算(能简算的要简算).
85×0.75+15×75%
5
7
+
5
9
×
3
2
+
1
6

3.68×[1÷(2.1-2.09)]
[(
4
5
-
1
4
)×
6
11
9
20
▼优质解答
答案和解析
(1)85×0.75+15×75%,
=85×0.75+15×0.75,
=(85+15)×0.75,
=100×0.75,
=75;

(2)
5
7
+
5
9
×
3
2
+
1
6

=
5
7
+
5
6
+
1
6

=
5
7
+(
5
6
+
1
6
),
=
5
7
+1,
=1
5
7


(3)3.68×[1÷(2.1-2.09)],
=3.68×[1÷0.01],
=3.68×100,
=368;

(4)[(
4
5
-
1
4
)×
6
11
9
20

=[
11
20
×
6
11
9
20

=
6
20
÷
9
20

=
2
3