Question

Se stie ca : a+5×b =3 ×b+c ,iar c =180.Afla valoarea expresiei : a+2 ×b +4×c -583=?

Answer 1

$a + 5b = 3b + c$
$c = 180$
$a + 5b = 3b + 180$

$a + 5b - 3b = 180$
$a + 2b = 180$
$a = 180 - 2b$
$180 - 2b + 2b + 4 \times 180 - 583 =$
$= 180 + 4 \times 180 - 583$
$= 180 + 720 - 583$
$= 900 - 583$
$= 317$