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The number of real roots of x^5+2x^3+x^2+2=0 is ___?
0/3/5/1
$x^5+2x^3+x^2+2=0$
$\Rightarrow (x+1) (x^2+2)(x^2-x+1)=0$
so $(x+1)=0 \Rightarrow x=-1$ is only the real roots
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