### No.1 ###

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

### No.2 ###

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

### No.3 ###

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

### No.4 ###

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

### No.5 ###

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

### No.6 ###

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