Question

помогите срочно!!!! ( 1 2/7 : 2 4/7 - 2/5 × 5/6)+ 2 2/5 : 2 2/15

Answer 1

=9/7÷18/7- 1/3+12/5÷32/15=
=9/7×7/18-1/3+12/5×15/32=
=1/2-1/3+9/8=12/24-8/24+27/24=31/24=1 7/24

Answer 2

$( 1\frac{2}{7} : 2\frac{4}{7} - \frac{2}{5} * \frac{5}{6} )+ 2\frac{2}{5}: 2\frac{2}{15} = ( \frac{9}{7}* \frac{7}{18} - \frac{1}{3} )+ \frac{12}{5} * \frac{15}{32} = ( \frac{1}{2} - \frac{1}{3} )+ \frac{9}{8}=$
$\frac{1}{6} + \frac{9}{8} = \frac{4+27}{24} = \frac{31}{24}= 1\frac{7}{24}$