Question

a:b=3
c:a=2
c-b=45
2b+a+3c=?

Answer 1

Răspuns:

Explicație pas cu pas:

a : b = 3 =>   a = 3 × b

c : a = 2 ⇒     c = 2 × a = 2 × 3 × b   =>     c = 6 × b

__________________

c - b = 45

6 × b - b = 45          

5 × b = 45            ⇒    b = 9

_____________________

a = 3 × b = 3 × 9    ⇒     a = 27

c = 2 × a = 2 × 27  ⇒     c = 54

________________________

2 b + a + 3 c =  207

= 2 × 9 + 27 + 3 × 54 =

= 18 + 27 + 162 =

= 27 + 180 =

= 207