Bài 1)tìm Min hay Max

a) G=\(\dfrac{2}{x^2+8}\)

b) H=\(\dfrac{-3}{x^2-5x+1}\)

Bài 2) Tìm Min hay Max

a)D=\(\dfrac{2x^2-16x+41}{x^2-8x+22}\)

b)E=\(\dfrac{4x^4-x^2-1}{\left(x^2+1\right)^2}\)

c)G=\(\dfrac{3x^2-12x+10}{x^2-4x+5}\)