Question

cine stie
 trei nr sunt invers proportionale cu nr 0,2 0,(3) si 0.25 . aflati cele 3 nr daca suma lor este 72?

Answer 1

1/5*x= 1/3*y= 1/4*z <=> 5*x= 3*y= 4*z ; x+y+z= 72 <=> z= 5*x/4 y= 5*x/3 <=> x + 5*x/4 + 5*x/3 = 72 <=> 47x = 864 <=> x = 864/47, y = 4320/141, z = 4320/188. Daca le aduni, chiar primesti 72 xD.