3
4 +
1
2 = 1
1
5 ,
1
3 -
1
4 =
1
12 ,
12×
3
4 =9,
2
7 ×14=4,
20÷
4
9 =45,
2
3 ×
7
8 =
7
12 , 0×
2
13 =0,
2
5 ÷
3
2 =
4
15 ,
1
2 ÷
2
3 ×12=9, 14×
5
7 ÷14×
5
7 =
25
49 .
3
4 +
1
2 = 1
1
5 ,
1
3 -
1
4 =
1
12 ,
12×
3
4 =9,
2
7 ×14=4,
20÷
4
9 =45,
2
3 ×
7
8 =
7
12 , 0×
2
13 =0,
2
5 ÷
3
2 =
4
15 ,
1
2 ÷
2
3 ×12=9, 14×
5
7 ÷14×
5
7 =
25
49 .