Question

Suma a doua nr este 47, iar suma rasturnatelor lor 173. Determinati cele doua nr. VA ROGGGGG!!!!!!!!!!!!!!!!!!!!!!

Answer 1

x+y=47
1/x+1/y=173
 
$\left \{ {{x+y=47} \atop { \frac{x+y}{xy} =173}} \right.$
$\left \{ {{x=47-y} \atop {47=173xy}} \right.$
$\left \{ {{x=47-y} \atop {47=173(47y-y^2)}} \right.$
$\left \{ {{x=47-y \atop {47=173*47y-173y^2}} \right.$

Answer 2

a+b=47;
⇒a sib-numere naturale de doua cifre;
⇒suma rasturnatelor=173;
⇒a=28⇒b=19;
⇒82+81=173⇒adevarat;
⇒a=29⇒b=18;
⇒92+81=173⇒adevarat;
⇒problema are 2 solutii;
⇒a,b∈[[29,18],[28,19]];