Rozwiązane

Oblicz:
a) 15 7/12 - (13 1/6 - 8 5/8 + 3 2/3)=
b) 7 1/3 - (3 1/2 + 2 3/4)=
c) 12 3/4 - [4 7/8 - (7 2/3 - 4 5/6)]=

jak jest np 15 7/2 to znaczy ze jest to pietnascie calych i siedem drugich



Odpowiedź :

Magda
a).15 i 7/12 - (13 i 1/6 - 8 i 5/8 +3 i 2/3) =
= 15 i 7/12 - (13 i 4/24 - 8 i 15/24 +3 i 16/24) = 15 i 7/12 - 8 i 5/24 =
= 15 i 14/24 - 8 i 5/24 = 7 i 9/24 = 7 i 3/8

b).7 i 1/3 - (3 i 1/2 +2 i 3/4) = 7 i 1/3 - (3 i 2/4 +2 i 3/4) = 7 i 1/3 - 5 i 5/4 =
= 7 i 1/3 - 6 i 1/4 = 7 i 4/12 - 6 i 3/12 = 1 i 1/12

c).12 i 3/4 - [4 i 7/8 - (7 i 2/3 - 4 i 5/6)] = 12 i 3/4 - [4 i 7/8 - (7 i 4/6 - 4 i 5/6)] =
= 12 i 3/4 - [4 i 7/8 - (6 i 10/6 - 4 i 5/6)] = 12 i 3/4 - (4 i 7/8 - 2 i 5/6) =
= 12 i 3/4 - (4 i 21/24 - 2 i 20/24) = 12 i 3/4 - 2 i 1/24 =
= 12 i 18/24 - 2 i 1/24 = 10 i 17/24

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