Question

Aflați x din proporții:

a) x/2=15/8;

b)17/x=34/3;

c) n/100x=19999/3,

unde n=19999^2 - 19999 × 999.​

Answer 1

Răspuns:

a) $\frac{x}{2} =\frac{15}{8}$  => 8x= 30   x= 30/8= 15/4  ( se simplifica prin 2)

b) $\frac{17}{x} =\frac{34}{3}$  =>  x= $\frac{17*3}{34}$   = $\frac{3}{2}$   ( se simplifica prin 17)

c) n= 19999(19999-999)= 19999* 19000

$\frac{19999*19000}{100x} =\frac{19999}{3}$   x= $\frac{19999*3*19000}{19999*100}$  = 3*190  

x= 570