Salut !
A = 2/3 - 7/3 × 8/21
= 2/3 - (7×8)/(3×21)
= 2/3 - 56/63
= (2×21)/(3×21) - 56/63
= 42/63 - 56/63
= -14/63
= - (2×7) / (9×7)
= -2/9
B = (11/7 - 2/5) × 24/7
= ((11×5)/(7×5)-(2×7)/(5×7)) × 24/7
= (55/35 - 14/35) × 24/7
= 41/35 × 24/7
= 984/245
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Salut !
A = 2/3 - 7/3 × 8/21
= 2/3 - (7×8)/(3×21)
= 2/3 - 56/63
= (2×21)/(3×21) - 56/63
= 42/63 - 56/63
= -14/63
= - (2×7) / (9×7)
= -2/9
B = (11/7 - 2/5) × 24/7
= ((11×5)/(7×5)-(2×7)/(5×7)) × 24/7
= (55/35 - 14/35) × 24/7
= 41/35 × 24/7
= 984/245