Explications étape par étape:
A = 34/5 ÷ [(4×8)/5×8) - (3×5)/(8×5)]
A = 34/5 ÷ (32/40 - 15/40)
A = 34/5 ÷ 15/40
A = 34/5 × 40/15 = 34/5 × 8/3
A = 272/15
B = 5,6 + (5/6 × 12/25)
B = 5/6 + (1/6 × 12/5)
B = 5/6 + (1 × 2/5) = 5/6 + 2/5
B = (5×5)/(6×5) + (2×6)/(5×6) = 25/30 + 12/30
B = 37/30
C = 7/12 - (1/54 × 45/2)
C = 7/12 - (1/6 × 5/2)
C = 7/12 - 5/12
C = 2/12 = 1/6
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Explications étape par étape:
A = 34/5 ÷ [(4×8)/5×8) - (3×5)/(8×5)]
A = 34/5 ÷ (32/40 - 15/40)
A = 34/5 ÷ 15/40
A = 34/5 × 40/15 = 34/5 × 8/3
A = 272/15
B = 5,6 + (5/6 × 12/25)
B = 5/6 + (1/6 × 12/5)
B = 5/6 + (1 × 2/5) = 5/6 + 2/5
B = (5×5)/(6×5) + (2×6)/(5×6) = 25/30 + 12/30
B = 37/30
C = 7/12 - (1/54 × 45/2)
C = 7/12 - (1/6 × 5/2)
C = 7/12 - 5/12
C = 2/12 = 1/6