Question

tìm điều kiện xác định

\(\dfrac{1}{13-2x}\)

Answer 1

\(\dfrac{1}{13-2x}\)

Xác định khi:

\(13-2x>0\)

\(\Leftrightarrow-2x>-13\)

\(\Leftrightarrow2x< 13\)

\(\Leftrightarrow x< \dfrac{13}{2}\)

Answer 2

`1/(13-2x)`

`->` ĐKXĐ : `x=13/2`

`13-2x=0`

`<=>13=2x`

`<=>2x=13`

`<=>x=13/2`