Question

Calculati trei numere rationale, stiind ca sunt direct proportionale cu 5,7 si,respectiv 12, iar suma lor este 252. Si please am nevoie acum de raspuns

Answer 1

a,b,c-nr.rationale
{a,b,c}d.p.{5,7,12}⇒$\frac{a}{5} = \frac{b}{7} = \frac{c}{12} =k$⇒a=5k;b=7k;c=12k
a+b+bc=252⇒5k+7k+12k=252⇒24k=252⇒k=10.5⇒a=52.5;b=73.5;c=126

Answer 2

x+y+z=252 
$\frac{x}{5} = \frac{y}{7} = \frac{z}{12}$ ⇒ $\frac{252}{24}$=10.5 
x=52.5
y=73.5
z=126 
Nush daca e bine ca nu l.am facut pe foaie ...