Question

3/9(4b+1/2a)+2/8a, при а = 4 и b = 2.

Answer 1

1/3 ( 8  + 2) + 1 =  10/3 +1 = 3целых 1/3 +1 = 4 целых 1/3

Answer 2

$\frac{1}{3} (4b+ \frac{1}{2} a)+ \frac{1}{4} a= \frac{16}{12} b+ \frac{2}{12} a+ \frac{3}{12} a= \frac{16}{12} b+ \frac{5}{12} a$
Подставляем: 

$\frac{16*2}{12} + \frac{5*4}{12} = \frac{9}{3} =3$