Explications étape par étape:
A = (5×2)/(9×2) - (7×3)/(6×3)
A = 10/18 - 21/18
A = -11/18
B = 7/25 × 10/-21
B = 7/(5×5) × (2×5)/-(3×7)
B = 1/5 × 2/-3
B = 2/-15
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Explications étape par étape:
A = (5×2)/(9×2) - (7×3)/(6×3)
A = 10/18 - 21/18
A = -11/18
B = 7/25 × 10/-21
B = 7/(5×5) × (2×5)/-(3×7)
B = 1/5 × 2/-3
B = 2/-15