Question

Nr naturale x, y, z dunt direct proportionale cu 3, 4, 5. Aflati nr stiind ca x+2y+3z=78

Answer 1

x,y,z  d.p cu 3,4,5 =>  x/3=y/4=z/5=k
x/3=k => x=3k
y/4=k => y=4k
z/5=k => z=5k
x+2y+3z=78 => 3k+2*4k+3*5k=78 => 3k+8k+15k=78 => 26k=78 => k=78/26=3
=>x=3k=3*3=9
y=4k=4*3=12
z=5k=5*3=15
Succes maine !!!