X^2-144=0; 100-81x^2=0; 196-y^2=0; 225y^2-64=0
1)х^2 = 144; x = 12 2)81x^2 = 100 (9x)^2 = 10^2 9x = 10 x = 10/9 3) y^2 = 196 y =14 4) 225y^2 = 64 (15y)^2 = 8^2 15y = 8 y = 8/15
77*2-144=0 196-98*2=0