Answer:
I understand that it is necessary to calculate
1/2 - 1/3 + 1/4 =
put to the common denominator 12 =
(6-4+3)/12 = 5/12
2/3 + 1/2 + 1/3 =
put to the common denominator 6 =
(4+3+2)/6 = 9/6 = 3/2
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