过点M(a,-1)作抛物线X^2=4Y的两条切线MA,MB,且A,B为两切点,求证直线AB过定点过点M(a,-1)作抛物线X^2=4Y的两条切线MA,MB,且A,B为两切点,1)求证直线AB过定点,并求出定点坐标2)若a属于[-2,2],试求直线AB
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![过点M(a,-1)作抛物线X^2=4Y的两条切线MA,MB,且A,B为两切点,求证直线AB过定点过点M(a,-1)作抛物线X^2=4Y的两条切线MA,MB,且A,B为两切点,1)求证直线AB过定点,并求出定点坐标2)若a属于[-2,2],试求直线AB](/uploads/image/z/4071454-70-4.jpg?t=%E8%BF%87%E7%82%B9M%28a%2C-1%29%E4%BD%9C%E6%8A%9B%E7%89%A9%E7%BA%BFX%5E2%3D4Y%E7%9A%84%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BFMA%2CMB%2C%E4%B8%94A%2CB%E4%B8%BA%E4%B8%A4%E5%88%87%E7%82%B9%2C%E6%B1%82%E8%AF%81%E7%9B%B4%E7%BA%BFAB%E8%BF%87%E5%AE%9A%E7%82%B9%E8%BF%87%E7%82%B9M%28a%2C-1%29%E4%BD%9C%E6%8A%9B%E7%89%A9%E7%BA%BFX%5E2%3D4Y%E7%9A%84%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BFMA%2CMB%2C%E4%B8%94A%2CB%E4%B8%BA%E4%B8%A4%E5%88%87%E7%82%B9%2C1%EF%BC%89%E6%B1%82%E8%AF%81%E7%9B%B4%E7%BA%BFAB%E8%BF%87%E5%AE%9A%E7%82%B9%2C%E5%B9%B6%E6%B1%82%E5%87%BA%E5%AE%9A%E7%82%B9%E5%9D%90%E6%A0%872%EF%BC%89%E8%8B%A5a%E5%B1%9E%E4%BA%8E%5B-2%2C2%5D%2C%E8%AF%95%E6%B1%82%E7%9B%B4%E7%BA%BFAB)
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