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[tex] \frac{2}{10} + \frac{5}{20} + \frac{8}{30} + \frac{11}{40} , \: [/tex]
если
[tex] \frac{3}{10} + \frac{5}{20} + \frac{7}{30} + \frac{9}{40} = a[/tex]
Объясните пожалуйста как решить!))
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