试题:
3
4
×
2
3
×
2
5
=______;
4
21
×
7
21
=______;
7
9
×
3
5
×
5
21
=______;
35
48
×
8
15
×
6
7
=______;
108×
7
18
=______;
64
95
×
19
32
=______;
9
14
×
35
36
=______;
5
24
×120=______;
11
15
×
25
33
=______;
17
36
×
72
85
=______;
4
15
+
5
12
=______;
29
42
×
56
87
=______;
4
2
5
×
10
11
=______;
2
4
5
×
15
28
=______;
3
5
7
×
8
13
×1
2
7
=______;
3
4
5
×4×
7
18
=______;
2
5
8
×3
3
7
×
1
9
=______;
19
20
×
4
9
×
25
38
=______;
2
5
6
×12=______;
3
3
7
×14=______;
5
1
5
×4=______;
7
3
8
×2=______;
3
1
2
×4=______;
7×3
2
15
=______;
7
12
×12
5
6
=______;
2
3
×6
4
5
=______;
7
25
-
1
5
)×50=______;
1
3
+
3
4
)×12=______;
1
3
÷
1
12
=
4
7
÷12=______;
8
9
÷
3
7
=______;
3
4
=______;
10
11
=______;
14
11
÷21=______;
5
8
÷
5
6
=______;
9
10
÷
3
5
=______;
8
9
÷
8
3
=______;
3
10
÷
10
3
=______;
1
5
×
5
8
=______;
3
5
÷5=______.

答案:

我来补答
3
4
×
2
3
×
2
5
=
1
5
4
21
×
7
21
=
4
63
7
9
×
3
5
×
5
21
=
1
9
35
48
×
8
15
×
6
7
=
1
3
108×
7
18
=42;
64
95
×
19
32
=
2
5
9
14
×
35
36
=
5
8
5
24
×120=25;
11
15
×
25
33
=
5
9
17
36
×
72
85
=
2
5
4
15
+
5
12
=
41
60
29
42
×
56
87
=
4
9
4
2
5
×
10
11
=4;
2
4
5
×
15
28
=
3
2
3
5
7
×
8
13
×1
2
7
=
144
49
3
4
5
×4×
7
18
=
266
45
2
5
8
×3
3
7
×
1
9
=1;
19
20
×
4
9
×
25
38
=
5
18
2
5
6
×12=34;
3
3
7
×14=48;
5
1
5
×4=
104
5
7
3
8
×2=
59
4
3
1
2
×4=14;
7×3
2
15
=
329
15
7
12
×12
5
6
=
539
72
2
3
×6
4
5
=
68
15
7
25
-
1
5
)×50=4;
1
3
+
3
4
)×12=13;
1
3
÷
1
12
=4;
4
7
÷12=
1
21
8
9
÷
3
7
=
56
27
3
4
=
4
3
10
11
=
11
2
14
11
÷21=
2
33
5
8
÷
5
6
=
3
4
9
10
÷
3
5
=
3
2
8
9
÷
8
3
=
1
3
3
10
÷
10
3
=
9
100
1
5
×
5
8
=
1
8
3
5
÷5=
3
25
 
 
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