Odpowiedź:
(2/3+5/6):3-(7/9-1/2)=
= (4/6 + 5/6) * 1/3 - (14/18 - 9/18) =
= 9/6 * 1/3 - 5/18=
= 9/2 * 1/1 - 5/18=
= 9/2 - 5/18 =
= 4 i 1/2 - 5/18=
= 4 i 9/18 - 5/18=
= 4 i 4/18 =
= 4 i 2/9
