Question

giúp mình câu này với ạ,ghi rõ ra luôn ạ

Answer 1

\(Đk:x\ne0;3\)

\(\Leftrightarrow\dfrac{x+3}{x-3}=\dfrac{18}{x\left(x-3\right)}+\dfrac{8}{x}\)

\(\Leftrightarrow\dfrac{x\left(x+3\right)}{x\left(x-3\right)}=\dfrac{18+8\left(x-3\right)}{x\left(x-3\right)}\)

\(\Leftrightarrow x^2+3x=18+8x-24\)

\(\Leftrightarrow x^2-5x+6=0\)

\(\Leftrightarrow\left(x-3\right)\left(x-2\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=3\left(ktm\right)\\x=2\left(tm\right)\end{matrix}\right.\)

Answer 2

x+3/x-3=18/x²-3x+8/x

x(x+3)/x(x-3)=18/x(x-3)+8(x-3)/x(x-3)

=>x(x+3)=18+8(x-3)

x²+3x=18+8x-24

x²+3x-8x=18-24

x²-5x=-6

x²-5x+6=0

x²-2x-3x+6=0

x(x-2)-3(x-2)=0

(x-3)(x-2)=0

=>x-3=0 hoặc x-2=0

=>x=3 hoặc x=2