Question

Determinati numerele x, y,z stiind ca sunt direct proportionale cu : 3,7 si 9 cu suma lor 570.

Answer 1

Răspuns:

(x, y, z) d.p (3,7,9)

3/x=7/y=9/z=k

3/x=k=>x=3k

7/y=k=>x=7k

9/z=k=>z=9k

x+y+z=570

3k+7k+9k=570

19k=570

k=30

x=3×30=90

y=7×30=210

z=9×30=270

V:90+210+270=570