试题:
用递等式计算
①(
2
3
-
2
5
)÷(
1
8
+
5
12

②(
4
5
+
1
4
)÷
7
3
+
7
10

③253+292÷73.

答案:

我来补答
①(
2
3
-
2
5
)÷(
1
8
+
5
12
),
=(
10
15
-
6
15
)÷(
3
24
+
10
24
),
=
4
15
÷
13
24

=
4
15
×
24
13

=
32
65


②(
4
5
+
1
4
)÷
7
3
+
7
10

=(
16
20
+
5
20
)÷
7
3
+
7
10

=
21
20
×
3
7
+
7
10

=
9
20
+
14
20

=1
3
20


③253+292÷73,
=253+4,
=257.
 
 
展开全文阅读
剩余:2000
这些题目你会做吗?