Chứng minh:\(\sqrt{X^2+\frac{1}{x^2}}+\sqrt{y^2+\frac{1}{y^2}}+\sqrt{z^2+\frac{1}{z^2}}>=\frac{3}{2}\sqrt{17}\)

a) x/5 = 2/3

$\Rightarrow3x=5.2$⇒3x=5.2

$\Rightarrow x=\frac{10}{3}$⇒x=103 

b) x/3 = 1/2

$\Rightarrow2x=3$⇒2x=3

$\Rightarrow x=\frac{3}{2}$⇒x=32 

c) x+3 / 15 = 1/3

$\Rightarrow3\left(x+3\right)=15$⇒3(x+3)=15

$\Rightarrow x+3=5$⇒x+3=5

$\Rightarrow x=2$⇒x=‍2

bản đồ pn ơi

Chứng minh:

a. x>√ x khi x>1

b. x<√ x khi 0<x<1