双曲线M的中心在原点,并以椭圆
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+
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=1的焦点为焦点,以抛物线y
2=-2
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x的准线为右准线.
(Ⅰ)求双曲线M的方程;
(Ⅱ)设直线l:y=kx+3 与双曲线M相交于A、B两点,O是原点.
①当k为何值时,使得
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•
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=0?
②是否存在这样的实数k,使A、B两点关于直线y=mx+12对称?若存在,求出k的值;若不存在,说明理由.
考点分析:
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