早教吧 育儿知识 作业答案 考试题库 百科 知识分享

计算下列各题(1)(45+14)÷73+710(2)519×14+1319×14+25%×119(3)13÷(23-25)×35(4)56÷[1-(34+112)].

题目详情
计算下列各题
(1)(
4
5
+
1
4
)÷
7
3
+
7
10
       
(2)
5
19
×
1
4
+
13
19
×
1
4
+25%×
1
19

(3)
1
3
÷(
2
3
-
2
5
)×
3
5
               
(4)
5
6
÷[1-(
3
4
+
1
12
)].
▼优质解答
答案和解析
(1)(
4
5
+
1
4
)÷
7
3
+
7
10

=(
16
20
+
5
20
)×
3
7
+
7
10

=
21
20
×
3
7
+
7
10

=
9
20
+
14
20

=
23
20

=1
3
20

       
(2)
5
19
×
1
4
+
13
19
×
1
4
+25%×
1
19

=(
5
19
+
13
19
+
1
19
)×
1
4

=1×
1
4

=
1
4


(3)
1
3
÷(
2
3
-
2
5
)×
3
5
 
=
1
3
÷(
10
15
6
15
)×
3
5

=
1
3
×
15
4
×
3
5

=
3
4



              
(4)
5
6
÷[1-(
3
4
+
1
12
)]
=
5
6
÷[1-
10
12
]
=
5
6
÷
1
6

=
5
6
×6
=5