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b)
2 i 2/3 - 1/2=
= 2 i 4/6 - 3/6=
= 2 i 1/6
b)
2 i 2/3 + 1/2=
= 2 i 4/6 + 3/6=
= 2 i 7/6=
= 3 i 1/6