Question

Ajutati-ma va rog!! Exercitiul 4.

Answer 1

Răspuns:

Explicație pas cu pas:

Answer 2

$\it 40(\overline{a,b}+\overline{b,a})=k^2 \Rightarrow 4\cdot10(\overline{a,b}+\overline{b,a})=k^2 \Rightarrow 4\cdot(\overline{ab}+\overline{ba})=k^2 \Rightarrow \\ \\ \Rightarrow 4\cdot(10a+b+10b+a)=k^2 \Rightarrow 2^2\cdot11(a+b)=k^2 \Rightarrow a+b=11\ \ \ \ \ (1) \\ \\ a<b\ \ \ \ \ \ (2)\\ \\ \overline{ab}\ -\ par \Rightarrow b=cifr\breve a\ \ par\breve a\ \ \ \ \ (3)$

$\it (1),\ (2),\ (3) \Rightarrow \overline{ab}\in\{38,\ 56\}$