Question

giúp mềm vói

Answer 1

a: \(A=\dfrac{3x-6-7}{x-2}=3-\dfrac{7}{x-2}\)

A min khi x-2=1

=>x=3

b: B=|3-x|+|4+x|>=|3-x+4+x|=7

Dấu = xảy ra khi -4<=x<=3