Bonjour
A = 7/3 - 4/3 / 8/5
= 3/3 / 8/5
= 1 × 5/8
= 5/8
B = -4/9 × 1/5 / 3/7
= -4×1/9×5 / 3/7
= -4/45 / 3/7
= -4/45 × 7/3
= -4×7 / 45×3
= -28/135
C = -8/3 / -5/6 + 7/4
= -8/3 × -6/5 + 7/4
= (-8)×(-6) / 3×5
= (-8)×(-2)×3 / 3×5
= 16/5
D = -7/5 / (2/9 - 7/18)
= -7/5 / (2×2/9×2 - 7/18
= -7/5 / (4/18 - 7/18)
= -7/5 / (-3/18)
= -7/5 / (-1×3/6×3)
= -7/5 / (-1/6)
= -7/5 × (-6/1)
= -7×-6 / 5×1
= 42/5
E = (4/5 + -3/2) / (-9/4 - 1/6)
= (4×2/5×2 + -3×5/2×5) / (-9×3/4×3 - 1×2/6×2)
= (8/10 -15/10) / (-18/12 - 2/12)
= (-7/10) / (-20/12)
= (-7/10) × (-12/20)
= -7×-12 / 10×20
= 84/200
= 21/50
