Question

-(2,3a+1,4b)+(0,6b - 2,7a)-(1,2b-5,2a) при a =5 1/2*b = 2/15

Answer 1

ОТвет   5/6
Решение

-(2,3a+1,4b)+(0,6b - 2,7a)-(1,2b-5,2a)= -2,3a-1,4b+0,6b - 2,7a-1,2b+5,2a =

= 0,2а -2b
$\frac{2}{10}a -2b=\frac{2}{10}* \frac{11}{2}-\frac{2}{1}*\frac{2}{15} = \frac{11}{10}-\frac{4}{15}=\frac{33-8}{30}=\frac{25}{30}=\frac{5}{6}$