e: ĐKXĐ: x<>0
\(\dfrac{1}{x}-2025-\left(\dfrac{1}{x}-2025\right)\left(x^2+2024\right)=0\)
=>\(\left(\dfrac{1}{x}-2025\right)\left(1-x^2-2024\right)=0\)
=>\(\dfrac{1}{x}-2025=0\)
=>\(\dfrac{1}{x}=2025\)
=>\(x=\dfrac{1}{2025}\left(nhận\right)\)
f: ĐKXĐ: x<>0
\(\dfrac{1}{x}+2=\left(\dfrac{1}{x}+2\right)\left(x^2+2\right)\)
=>\(\left(\dfrac{1}{x}+2\right)\left(x^2+2-1\right)=0\)
=>\(\left(\dfrac{1}{x}+2\right)\left(x^2+1\right)=0\)
mà \(x^2+1>=1>0\forall x\)
nên \(\dfrac{1}{x}+2=0\)
=>\(\dfrac{1}{x}=-2\)
=>\(x=-\dfrac{1}{2}\)(nhận)