1.

Consdier p(s)=s3=a22+a1s+a0 with all realcoefficients. It is known that its derivative p′(s) has no real roots. The number of real rotos of p(s) is

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Consdier p(s)=s3=a22+a1s+a0 with all realcoefficients. It is known that its derivative p(s) has no real roots. The number of real rotos of p(s) is



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