Explications étape par étape:
A = 3/4 - (5/4 × 7/3)
A = 3/4 - (5×7)/(4×3)
A = 3/4 - 35/12
A = (3×3)/(4×3) - 35/12
A = 9/12 - 35/12 = - 26/12 = -13/6
B = [ (2×4)/(3×4) + (3×3)/(4×3) ] ÷ 2/3
B = (8/12 + 9/12) ÷ 2/3
B = 17/12 ÷ 2/3
B = 17/12 × 3/2 = (17 ×3)/(3×4×2)
B = 17/8
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Explications étape par étape:
A = 3/4 - (5/4 × 7/3)
A = 3/4 - (5×7)/(4×3)
A = 3/4 - 35/12
A = (3×3)/(4×3) - 35/12
A = 9/12 - 35/12 = - 26/12 = -13/6
B = [ (2×4)/(3×4) + (3×3)/(4×3) ] ÷ 2/3
B = (8/12 + 9/12) ÷ 2/3
B = 17/12 ÷ 2/3
B = 17/12 × 3/2 = (17 ×3)/(3×4×2)
B = 17/8