2.- 12/4 - 3/5 = 60 -12 todo eso entre 20 = 48/20 = 24/10 = 12/5
3.- 2 1/4 + 3 2/3 = 9/4 + 11/3 = 44+27 todo eso entre 12 = 72/12
4.- 6 1/3 + 11/2 = 19/3 + 11/2 = 38 + 33 todo eso entre 6 = 71/6
5.- (3/5) (-6/3) (8/4) = (3/5) (-6/3) = (-18/15) (8/4) = - 144/60 = -36/15
6.- (134)(2)(1/2)(1/8) = (268/1)(1/16) = 268/16 = 67/4
7.- (-8/5)(-2/7) = 16/35
4.- 6 1/3 + 11/2 = 19/3 + 11/2 = 38 + 33 todo eso entre 6 = 71/6
5.- (3/5) (-6/3) (8/4) = (3/5) (-6/3) = (-18/15) (8/4) = - 144/60 = -36/15
6.- (134)(2)(1/2)(1/8) = (268/1)(1/16) = 268/16 = 67/4
7.- (-8/5)(-2/7) = 16/35
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