Question

-2(3,5-2,5)+4,5у при у= 4/5

Answer 1

$frac{4}{5}=0,8$
_____________________
-2(3,5y-2,5)+4,5y
-7y+5+4,5y
-2,5y+5
$-2,5*0,8+5=-2+5=3$