D 40 60 80 100 120 140
l 0,2 0,5 2 4 5 7,2
Смотри )))))))))((((((((((((
= - x^10 + 10x^7 + 32/x^5 - 40x^4 - 80/x^2 + 80x
2x^2 - 3x - 7 = 0
(x1)^2 + (x2)^2 = ?
2 = a
-3 = b
-7 = c
x1 + x2 = -b/a
x1*x2 = c/a
(x1 +x2)^2 = (-b/a)^2
(x1)^2 + (x2)^2 + 2*x1*x2 = (-b/a)^2
(x1)^2 + (x2)^2 + 2*(-7/2) = 9/4
(x1)^2 + (x2)^2 - 7 = 9/4
(x1)^2 + (x2)^2 = 37/4