,kOA=2,设l:y=2x+b,则圆心M到直线l的距离:d= ,由此能求出直线l的方程. (3) = ,即| |= ,又| |≤10,得t∈[2﹣2 ,2+2 ],对于任意t∈[2﹣2 ,2+2 ],欲使 ,只需要作直线TA的平行线,使圆心到直线的距离为 ,由此能求出实数t的取值范围. ...
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