Решите .
Пусть [tex]\displaystyle \dfrac{a}{b} =1-\frac{1}{2} +\frac{1}{3} -\frac{1}{4} + \ldots +\frac{1}{1319}[/tex] где Нод [tex](a \ ; \ b)=1[/tex] .

Докажите что [tex]1979 | \ a[/tex]
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