1*2*3=6
1*2+3=5
1*2-3=-1
1*2/3=0
1+2*3=9
1+2+3=6
1+2-3=0
1+2/3=1
1-2*3=-3
1-2+3=2
1-2-3=-4
1-2/3=0
1/2*3=0
1/2+3=3
1/2-3=-3
1/2/3=0