Полина0711 А)0,17+=+=+==1,85
б)2,5÷=2,5÷0,6=3,1

ColdMand А) \frac{0,17+3}{20} = \frac{3,17}{20}=0,1585
б) 2,5: \frac{3}{5} \frac{3}{5} = 2\frac{5}{10}: \frac{3}{5}  = \frac{25}{10}* \frac{5}{3}= \frac{25}{2}* \frac{1}{3}= \frac{25}{6}