Question

1/x-3 - 3/x = 3/x(x-3)

Answer 1

\(\Leftrightarrow x-3\left(x-3\right)=3\)

=>x-3x+9=3

=>-2x=-6

hay x=3(loại)

Answer 2

ĐK : x ≠ 3

\(\Leftrightarrow\dfrac{x}{x\left(x-3\right)}-\dfrac{3\left(x-3\right)}{x\left(x-3\right)}=\dfrac{3}{x\left(x-3\right)}\)

\(\Leftrightarrow x-3\left(x-3\right)=3\)

\(\Leftrightarrow x-3x+9=3\)

\(\Leftrightarrow-2x=-6\)

\(\Leftrightarrow x=3\left(L\right)\)

Vậy : S = ∅