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B) 5/6 - 4/3 = 5/6 - 8/6 = -3/6 = -1/2
C) 5/3 * -6/4 = -5*6/3*4 = -30/12 = - 5/2
D) -5/12 * 3/4 = - 15/48 = - 5/16
E) (1/6) / (4/3) = 1/6 * 3/4 = 3/24 = 1/8
F) (3/2) / (-4/9) = 3/2 * - 9/4 = - 27/8
G) -5/3 - (-4/9) = - 5/3 + 4/9 = - 15/9 + 4/9 = -11/9
H) -6/7 + (- 2/5) = - 6/7 - 2/5 = -30/35 - 14/35 = - 44/35
I) (-4/15) / (6/7) = -4/15*7/6 = - 26/90 = - 13/30
todas las que se podían simplificar, lo están.