题目

It’s only too natural that personal characteristics play a vital role in the development of one's intelligence. But people   36   to realize the importance of cultivating (培养) these factors. The so-called “non-intelligence factors” include one’s   37  , will, motivation, interests and habits. In their studies American psychologists   38   the main cause of differences in intelligence is not intelligence itself, but non-intelligence factors including the desire to learn, will-power and self-confidence.   39   people know one should have definite objectives, a strong w已知一次函数y=-x+3的图象与x轴交于点A、与y轴交于点B，BC∥x轴，且∠ACB的正切值为3．（1）求点A、B、C的坐标；（2）若某二次函数图象经过A、B、C三点，试求该图象的顶点坐标．