Problem 예제.

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다음 특성 방정식 중 안정한 것은?

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$2s^3+3s^2+4s+5=0$

$4s^4+3s^3-s^2+s+10=0$

$s^5+s^3+2s^2+4s+3=0$

$s^4-2s^3-3s^2+4s+5=0$