Răspuns:
Explicație pas cu pas:
1/2 + 1/3 + 1/6 = 3/6 + 2/6 + 1/6 = 6/6 = 1
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1/3 - 1/6 = 2/6 - 1/6 = 1/6
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1/7 + 1/14 = 2/14 + 1/14 = 3/14
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1/7 - 1/14 = 2/14 - 1/14 = 1/14
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1/3 + 1/9 - 5/12 = 12/36 + 4/36 - 15/36 = 1/36
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1/2 - 3/2 - 4/5 = -2/2 - 4/5 = -1 - 4/5 = -10/10 - 8/10 = -18/10 = -9/5