Question

4/9с-5/12с+7/18с если с = 1/5 ,3/5,2

Answer 1

$\frac{4}{9} c - \frac{5}{12} c + \frac{7}{18} c = \frac{16}{36} c - \frac{15}{36} c + \frac{14}{36} c = \frac{15c}{36} = \frac{5c}{12}$

при с = 1/5:
$\frac{5}{12} c = \frac{5}{12} \times \frac{1}{5} = \frac{1}{12}$
при с = 3/5:
$\frac{5}{12} \times \frac{3}{5} = \frac{3}{12} = \frac{1}{4}$
при с = 2
$\frac{5}{12} \times 2 = \frac{5}{6}$