X+yx−y=1312
(x - y)*13 = (x + y)*12(x−y)∗13=(x+y)∗12
13x - 13y = 12x + 12y13x−13y=12x+12y
13x - 12x = 13y + 12y13x−12x=13y+12y
x=25yx=25y
\frac{x}{y} =25yx=25
\frac{x {}^{2} }{y {}^{2} }= (\frac{x}{y} )^{2} = 25^{2}= 625y2x2=(yx)2=252=625
Ответ: 625