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4 số 1 để có 2, 3, 4
(1x1)+(1:1) =2
1+1+(1x1) =3
(1+1)x(1+1) =4
4 số 2 để có 0,1,2,3,4,5,6,10,12
2+2-2-2 = 0
2-2+ (2:2) = 1
(2:2) + (2:2) = 2
2+2- (2:2) = 3
2+2+2-2 = 4
2+2+ (2:2) = 5
2x2x2-2 = 6
2x2x2+2 = 10
(2x2+2)x2 = 12
4 số 3 để có 3, 4, 5, 6, 7, 8
3 =(3x3)-(3+3)
4 = ((3x3)+3):3
5 = (3+3) -3/3
6 =3+3+3-3
7 = 3+3+3/3
8 = 3x3-3/3
9 = (3x3) +3-3
10 = (3x3) + (3:3)
4 số 4 để có 3, 6, 7, 8, 24, 28, 32, 48
3 = (4+4+4)/4
6 = (4+4)/4 +4
7 = (4+4)-4/4
8 =(4x4)-(4+4)
24 = (4x4)+4+4
28 = (4+4)x4 -4
32 =(4x4) + (4x4 )
48 = (4+4+4)x4
4 số 5 để có 3, 5, 6, 26, 30, 50, 55
3 = (5+5+5)/5
5 = ((5-5):5) + 5
6 = [(5x5)+5]/5
26 = (5x5)+5/5
30 = (5 + (5:5)) x 5 = 30
50 = (5x5)+ (5x5)
55 = (5+5)x5 +5
120 = (5x5x5)-5
