Question

X,y,z direct proporționale cu 2,5,7 și produsul lor egal cu 560

Answer 1

(x,y,z) d.p. (2;5;7)

=> \frac{x}{2} = \frac{y}{5} = \frac{z}{7} = k => x=2k

y=5k

z=7k

x*y*z=560

2k*5k*7k=560

70*k³=560

k³=560:70

k³=8

k³=2³ => k=2

x=2*2 =>x=4

y=5*2 =>y=10

z=7*2 => z=14

Sper ca te-am ajutat !

Answer 2

/⇒fractie

X,y,z d.p 2,5,7

x/2=y/5=z/7

x/2=k⇒x=2k

y/5=k⇒y=5k

z/7=k⇒z=7k

2k+5k+7k=560

14=560

560:40=40

x/2=k⇒x=2k x40=80

y/5=k⇒y=5k x 40=200

z/7=k⇒z=7k x 40=280

proba:80+200+280=560