中点 (2,5),(-3,-6)

解答

中点

(2, 5), (- 3, - 6)

(- \frac{1}{2}, - \frac{1}{2})

求解步骤

(x_{1}, y_{1}), (x_{2}, y_{2})

的中点:

(\frac{x _{2} + x _{1}}{2}, \frac{y _{2} + y _{1}}{2})

(x_{1}, y_{1}) = (2, 5), (x_{2}, y_{2}) = (- 3, - 6)

= (\frac{- 3 + 2}{2}, \frac{- 6 + 5}{2})

整理后得

= (- \frac{1}{2}, - \frac{1}{2})

f = - 2

d er i v a t i v e f (x) = 3 - 4 x, at x = 8

d er i v a t i v e f (x) = \frac{1}{3 x ^{2}} - \frac{5}{2 x} + 8 x - 6

c a r t es ian (- 3, \frac{π}{6})

t an g e n t y^{3} + x y^{2} - 5 = x + 3 y^{2}, at x = 3