(x-y)(x+y)=25
x-y=7
x+y=25/7
2y=25/7-7
y=-12/7
x=7+y=37/7
х в квадрате=у в квадрате=25 x^2-y^2=25 (x-y)(x+y)=25 х-у=7=0 x-y=7 x-y=7
7(x+y)=25 x+y=25/ 7 2y=25/7-7 y=-12/7 x=7+y=37/7
x-y=7 x-y=7
(x-y)(x+y)=25
x-y=7
x+y=25/7
2y=25/7-7
y=-12/7
x=7+y=37/7
х в квадрате=у в квадрате=25 x^2-y^2=25 (x-y)(x+y)=25
х-у=7=0 x-y=7 x-y=7
7(x+y)=25 x+y=25/ 7 2y=25/7-7 y=-12/7 x=7+y=37/7
x-y=7 x-y=7