файл
x-y=1 y=1+x y=1+x y=1+x y=1+x xy=240 x(1+x)=240 x+x^2=240 x^2+x-240=0 (x+15)(x+16)=0
x2 + x - 240 = 0D = b2 - 4acD = 1 + 960 = 961 = 31
x1,2 = -b ± √D/2a x1 = -1 + 31/2= 30/2 = 15x2 = -1 - 31/2 = - 32/2 = -16 ответ: x1 = 15; x2 = -16
файл
x-y=1 y=1+x y=1+x y=1+x y=1+x
xy=240 x(1+x)=240 x+x^2=240 x^2+x-240=0 (x+15)(x+16)=0
x2 + x - 240 = 0
D = b2 - 4ac
D = 1 + 960 = 961 = 31
x1,2 = -b ± √D/2a
x1 = -1 + 31/2= 30/2 = 15
x2 = -1 - 31/2 = - 32/2 = -16
ответ: x1 = 15; x2 = -16