Question

Preciso de ajuda na 6

Answer 1

$\frac{8}{21} + \frac{1}{1+ \frac{1}{1+ \frac{1}{1+ \frac{3}{5} } } } = \\ \\ =\frac{8}{21} + \frac{1}{1+ \frac{1}{1+ \frac{1}{ \frac{8}{5} } } } = \\ \\= \frac{8}{21} + \frac{1}{1+ \frac{1}{1+ { \frac{5}{8} } } } =\\ \\= \frac{8}{21} + \frac{1}{1+ \frac{1}{{ \frac{13}{8} } } } = \\ \\ =\frac{8}{21} + \frac{1}{1+ \frac{8}{{ 13} } } = \\ \\ =\frac{8}{21} + \frac{1}{ \frac{21}{{ 13} } }= \\ \\ \frac{8}{21} + \frac{13}{21} = \frac{21}{21} =1$

LETRA D)