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1/3 - 1/6 = 1/3*2 = 2/6 - 1/6 ответ 1/6
3/20 + 3/4 = 3/4*5 = 15/20 - 3/20 = 12/20 ( сокращение) - 3/5
7/9 - 2/3 = 2/3*3 = 7/9 - 6/9 = 1/9
1/4 + 1/5 = 1/4*5 + 1/5*4 = 5/20 + 4/20 = 9/20
2/5 + 4/15 = 2/5 * 3 = 6/15 - 4/15 = 2/15