Оформите решение всех примеров так: 1/2 + 1/6 = 3+1/6=4/6=2/3
3/4 - 2/3
5/6 + 1/2
5/6 - 3/8
4/9 + 1/6
7/10 + 7/15
19/20 -37/40
7/20 + 3/4
19/20 + 37/40

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