1.
A•B-C :
3x7-5= 21-5 = 16
9x6-7= 54-5 = 47
8x5-4= 40-4 = 36
5x6-9= 30-9 = 21
4x8-9= 32-9 = 23
5x2-3= 10-3 = 7
2.
A•C-B :
3x5-7= 15-7 = 8
9x7-6= 63-6 = 57
8x4-5= 32-5 = 27
5x9-6= 45-6 = 39
4x9-8= 36-8 = 28
5x3-2= 15-2 = 13
3.
(A•B) - (A+C)
(3x7) - (3+5)= 21-8 = 13
(9x6) - (9+7)= 54-16 = 38
(8x5) - (8+4)= 40-12 = 28
(5x6) - (5+9)= 30-14 = 16
(4x8) - (4+9)= 32-13 = 19
(5x2) - (5+3)= 10-8 = 2
4.
(A•B) + (A•C)
(3x7) + (3x5)= 21+15 = 36
(9x6) + (9x7)= 54+63 = 117
(8x5) + (8x4)= 40+32 = 72
(5x6) + (5x9)= 30+45 = 75
(4x8) + (8x9)= 32+72 = 104
(5x2) + (5x3)= 10+15 = 25
Bafta..
