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ʵÃÕÇÔ·¤ÃѺ
1.ãËé f à»ç¹àÊé¹â¤é§·ÕèÁÕÍѵÃÒ¡ÒÃà»ÅÕè¹á»Å§¢Í§¤ÇÒÁªÑ¹ à·èҡѺ $6x-2$ áÅШÐÁըشÊÙ§ÊØ´ÊÑÁ¾Ñ¹¸ì¤×Í (0,2)¶éÒ f ÁըشµèÓÊØ´ÊÑÁ¾Ñ¹¸ìáÅéÇ ¨Ðà¡Ô´·Õè¨Ø´ã¤
2.ãËé a,b à»ç¹¨Ó¹Ç¹àµçÁã´æáÅÐ$p(x)=x^3+ax^2-bx+5$ ¶éÒ $x-2$ ËÒà p(x) àËÅ×ÍàÈÉà·èҡѺ 15 áÅéÇ µÑÇËÒÃÃèÇÁÁÒ¡¢Í§ a,b ÁÕ¤èÒà·èÒäà 3.ãËé $z_1,z_2,z_3$ à»ç¹¨Ó¹Ç¹àªÔ§ªé͹·ÕèᵡµèÒ§¡Ñ¹·Ñé§ËÁ´ ªÖè§ ${z_1}^2+z_1z_2+{z_2}^2={z_2}^2+z_2z_3+{z_3}^2={z_3}^2+z_3z_1+{z_1}^2=0$ áÅéǤèҢͧ$\frac{z_1+z_2}{z_3}+\frac{z_2+z_3}{z_1}+\frac{z_3+z_1}{z_2}$ |
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