### No.1 ###

1+7=8
+ -  
5+4=9
= =  
6/3=2

### No.2 ###

7+1=8
+ +  
2*3=6
= =  
9-4=5

### No.3 ###

9-4=5
- -  
7+1=8
= =  
2*3=6

### No.4 ###

9-4=5
- -  
2*3=6
= =  
7+1=8

### No.5 ###

2*3=6
+ +  
7+1=8
= =  
9-4=5

### No.6 ###

6/3=2
- +  
5+4=9
= =  
1+7=8