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Explications étape par étape:

A = 1/72 - (3×8)/(9×7) = 1/72 - 24/72 = -23/72

C = (5×10)/10 - 7/10 = 50/10 - 7/10 = 43/10

E = 9/3 + (1×3)/3 = 9/13 + 3/3 = 12/3 = 4

G = 8/54 + (1×9)/(6×9) = 8/54 + 9/54 = 17/54

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