giải hộ mình bcd với ạ

`\color{#a8b0b4}{⸻}\color{#91999d}{⸻}\color{#7a8286}{『}\color{#636b6f}{♡} \color{#4c5356}{E}\color{#434a4d}{m}\color{#3b4244}{p}\color{#2a3133}{t}\color{#21282a}{y}\color{#1a2123}{B}\color{#141a1c}{o} \color{#0f1516}{y} \color{#05090a}{♡}\color{#0a1011}{』}\color{#141a1c}{⸻}\color{#1a2123}{⸻}`

`b)`

`x^2-0,123>=0`

`x^2>=0,123`

`|x|>=\sqrt{0,123}`

`x>=\sqrt{0,123}` hoặc `x<= -\sqrt{0,123}`

`x>=0,35` hoặc `x<=-0,35`

`c)`

`13x=1/x>0`

`13x^2-1>0`

`13x^2>1`

`x^2>1/13`

`x^2-1/13>0`

`(x-\sqrt13/13)*(x+\sqrt13/13)>0`

`x<{-\sqrt13}/13` hoặc `\sqrt13/13<x`

`d)`

`\sqrt5x<=\sqrt2`

`x<=\sqrt2/\sqrt5=\sqrt10/5`

Vậy : ...