a)
6 x 12 - 52 : 4 = 72 - 13 = 59
(25 + 75) : (53 - 48) = 100 : 5 = 20
53 - 3 x (43 - 19) : 6 = 53 - 3 x 24 : 6 = 53 - 72 : 6 = 53 - 12 = 41
b)
(125 : 25 + 50) : 11 = (5 + 50) : 11 = 55 : 11 = 5
(8 x 7 - 50) x6 : 4 = (56 - 50) x 6 : 4 = 6 x 6 : 4 = 36 : 4=9
98 + 2 x (38 + 31 x 2) = 98 + 2 x (38 + 62) = 98 + 2 x 100 = 98 + 200 = 298
c)
126 - 10 x 2^3 = 126 - 10 x 8 = 126 - 80 = 46
2500 : 10^2 - 5^2 = 2500 : 100 - 25 = 25 - 25 = 0
2^4 x 4 : (71 - 39) = 16 x 4 : 32 = 64 : 32 = 2
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