Question

sa se afle x folosind proportii derivate:
x+4/x=5/3
11,5/2,5=x+4,5/x-4,5

Answer 1

(x+4)/x=5/3 <=> (x+4)/3=10/6 => x=6

11,5/2,5=(x+4,5)/(x-4,5) <=> 23/5=(2x+9/2x-9)

23/5=(2x+9/2x-9) <=> (23-9)/5=(2x+9-9)/(2x-9)

14/5=2x/(2x-9)  => x=7

Answer 2

Ai rezolvarea mai jos