Răspuns :
Hei! :)
[tex]a) \frac{x}{5} =\frac{5}{x} \\=> x^{2} =25 => x=5[/tex]
[tex]b) \frac{10}{x} =\frac{x}{3,6} \\=> x^{2} =3,6*10=36\\=> x=6[/tex]
[tex]c) \frac{x}{0,75} =\frac{0,(3)}{x} \\=> x^{2} =0,75*0,(3)= 0,75*\frac{1}{3} =0,25\\=> x=0,5[/tex]