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-7 3/7 + 3,3 = - 7 3/7 + 3 3/10 = - 52/7 + 33/10 = - 520/70 + 231/70 = - 289/70 =
= - 4 9/70
-7,8 - ( - 2 5/8 ) = - 7,8 + 2,625 = - 5,175
7,23 - 1 4/5 = 7,23 - 1,8 = 5,43
-7 3/7 + 3,3 = -7 3/7 + 3 3/10 = -7 30/70 + 3 21/70 = -4 9/70
-7,8 - (-2 5/8) = -7,8 + 2 5/8 = -7 8/10 + 2 5/8 = -7 64/80 + 2 50/80 = -5 14/80
7,23 - 1 4/5 = 7 23/100 - 1 4/5 = 7 23/100 - 1 80/100 = 6 57/100