1 уравнение А 2 расчет

$0.5x+2 \frac{1}{2} x-0.68=1.72$
$0.5x+(2 +0.5) x=1.72+0.68$
$0.5x+2.5 x=2.4$
$3x=2.4$
x=2.4:3
x=0.8

2) $4 \frac{1}{6} *0.6+6 \frac{2}{5}:1 \frac{1}{7} -6.7= \frac{4*6+1}{6} * \frac{6}{10} + \frac{6*5+2}{5}: \frac{1*7+1}{7} -6 \frac{7}{10}$ $= \frac{25}{10} + \frac{32}{5}* \frac{7}{8} -\frac{67}{10} =\frac{25}{10} + \frac{56}{10} -\frac{67}{10}= \frac{25+56-67}{10} = \frac{14}{10} = \frac{7}{5}$