\(P=\dfrac{x}{2x-2}+\dfrac{x^2+1}{2-2x^2}\)
a: \(P=\dfrac{x}{2\left(x-1\right)}-\dfrac{x^2+1}{2\left(x-1\right)\left(x+1\right)}\)
\(=\dfrac{x^2+x-x^2-1}{2\left(x-1\right)\left(x+1\right)}=\dfrac{1}{2\left(x+1\right)}\)
b: Để P=-1/2 thì 1/2(x+1)=-1/2
=>x+1=-1
=>x=-2
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