问题 解答题
口算:
24×
5
6
2
9
+
1
3
3
19
×57
1
2
+
1
3
4
5
×
5
8
2-1
3
8
1
4
+
5
6
3
4
-
3
5
1-
2
3
-
1
3
2
5
+
3
5
-
2
5
+
3
5
1
10
×9+
1
10
答案

24×
5
6
=20,
2
9
+
1
3
=
5
9
3
19
×57=9,
1
2
+
1
3
=
5
6
4
5
×
5
8
=
1
2
2-1
3
8
=
5
8
1
4
+
5
6
=
13
12
3
4
-
3
5
=
3
20
1-
2
3
-
1
3
=0,
2
5
+
3
5
-
2
5
+
3
5
=
6
5
1
10
×9+
1
10
=9.

单项选择题
单项选择题