№1. Выполните действия: a) $$20\frac{17}{37}+14\frac{12}{37}+31\frac{8}{37}$$;

a) $$20\frac{17}{37}+14\frac{12}{37}+31\frac{8}{37} = (20+14+31) + (\frac{17}{37} + \frac{12}{37} + \frac{8}{37}) = 65 + \frac{17+12+8}{37} = 65 + \frac{37}{37} = 65 + 1 = 66$$

Ответ: 66