66 и 67 срочно. Плизззззззз

А) $\frac{13}{25} + 0,39 = \frac{52}{100} + \frac{39}{100} = \frac{91}{100} = 0,91$

б) $\frac{4}{5} - 0,37 = \frac{80}{100} - \frac{37}{100} = \frac{43}{100} = 0,43$

в) $0,6 + \frac{4}{9} = \frac{3}{5} + \frac{4}{9} = \frac{27}{45} + \frac{20}{45} = \frac{47}{45} = 1 \frac{2}{45}$

г) $\frac{5}{6} - 0,75 = \frac{5}{6} - \frac{3}{4} = \frac{10}{12} - \frac{9}{12} = \frac{1}{12}$

67. $x - \frac{3}{5} = \frac{1}{15}$
$x = \frac{1}{15} + \frac{9}{15}$
$x = \frac{10}{15}$
$x = \frac{2}{3}$