问题 解答题
口算
5
9
×15=
3
5
×2=
1
4
×
4
5
=
1
9
×
3
7
=
7
12
×
3
4
=
3
20
=
2
5
×
15
4
=
4
17
×34=
8
21
×
7
16
=
1
20
×
2
3
=
5
6
×
2
15
=
15
17
×
17
15
=
3
4
×
1
5
=
6
11
×
1
12
=
3
22
×
11
13
=
7
6
×24=
4
7
×
3
8
=
13
15
×30=
28×
7
24
=
5
6
×
3
7
=
答案

5
9
×15=
25
3
3
5
×2=
6
5
1
4
×
4
5
=
1
5
1
9
×
3
7
=
1
21
7
12
×
3
4
=
7
16

3
20
=
3
20
2
5
×
15
4
=
3
2
4
17
×34=8;
8
21
×
7
16
=
1
6
1
20
×
2
3
=
1
30

5
6
×
2
15
=
1
9
15
17
×
17
15
=1;
3
4
×
1
5
=
3
20
6
11
×
1
12
=
1
22
3
22
×
11
13
=
3
26

7
6
×24=28;
4
7
×
3
8
=
3
14
13
15
×30=26;28×
7
24
=
49
6
5
6
×
3
7
=
5
14

单项选择题
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