第1个回答 2014-04-19
一、口
算
(
1
)
15×
3
=
(
2
)
42÷
7
=
(
3
)
9×
5
=
(
4
)
28÷
4
=
(
5
)
12×
3
=
(
6
)
35÷
7
(
7
)
19×
2
=
(
8
)
18×
3
=
(
9
)
21
+
32
=
(
10
)
19
+
17
=
(
11
)
28
+
9
=
(
12
)
36
+
5
=
(
13
)
28
+
3
=
(
14
)
16
+
30
=
(
15
)
28
-
6
=
(
16
)
13×
3
+
20
=
(
17
)
45÷
9
+
37
=
(
18
)
100
-
9×
3
=
(
19
)
80
+
5×
4
=
(
20
)
30
-
36÷
4
=