Explications étape par étape:
A = (4×8)/(7×8) + (7×7)/(8×7) =
32/56 + 49/56 = 81/56
B = (6×4)/(5×4) -1/20
24/20 - 1/20 = 23/20
C = ( -36×-25) / 5×12 = -3×-5 = 15
D = (3/8) × (16/9) = 2/3
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Explications étape par étape:
A = (4×8)/(7×8) + (7×7)/(8×7) =
32/56 + 49/56 = 81/56
B = (6×4)/(5×4) -1/20
24/20 - 1/20 = 23/20
C = ( -36×-25) / 5×12 = -3×-5 = 15
D = (3/8) × (16/9) = 2/3