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如图,点A(a,b)是抛物线y=x2上位于第二象限的一动点,OB⊥OA交抛物线于点B(c,d).当点A在抛物线上运动的过程中,以下结论:①ac为定值;②ac=﹣bd;③△AOB的面积为定值;④直线A...
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