①
3
4 +
1
2 =
5
4 ②
1
3 -
1
4 =
1
12 ③ 12×
3
4 =9 ④ 20÷
4
9 =45 ⑤
2
3 ×
7
8 =
7
12
⑥
2
5 ÷
3
2 =
4
15 ⑦ 0×
2
13 =0 ⑧
1
2 ÷
2
3 =
3
4 ⑨
2
7 ×14 =4 ⑩
1
5 ÷3 =
1
15 故答案为:
5
4 ,
1
12 ,9,45,
7
12 ,
4
15 ,0,
3
4 ,4,
1
15 .
①
3
4 +
1
2 =
5
4 ②
1
3 -
1
4 =
1
12 ③ 12×
3
4 =9 ④ 20÷
4
9 =45 ⑤
2
3 ×
7
8 =
7
12
⑥
2
5 ÷
3
2 =
4
15 ⑦ 0×
2
13 =0 ⑧
1
2 ÷
2
3 =
3
4 ⑨
2
7 ×14 =4 ⑩
1
5 ÷3 =
1
15 故答案为:
5
4 ,
1
12 ,9,45,
7
12 ,
4
15 ,0,
3
4 ,4,
1
15 .