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Najpierw żeby było łatwiej zamieńmy sobie ułamek na ułamek niewłaściwy, czyli
2 4/5 = 14/5
2/5 + 4/5 + 8/5 = 14/5 = 2 4/5
Zad 14
Sprawdzamy:
A) 1 1/6 + 2 1/2 = 7/6 + 5/2 = 7/6 + 15/6 = 22/6 = 3 4/6 = 3 2/3
B) 5 - 1 5/8 = 25/5 - 13/8 = 200/40 - 65/40 = 135/40 = 3 15/40 = 3 3/8
C) 1 5/8 + 1 3/4 = 13/8 + 7/4 = 13/8 + 14/8 = 27/8 = 3 3/8
D) 7 2/3 - 4 7/24 = 23/3 - 103/24 = 184/24 - 103/24 = 81/24 = 3 9/24 = 3 3/8
Czyli odpowiedź A