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要使直线y=kx+1(k∈R)与焦点在x轴上的椭圆+=1总有公共点,实数a的取值...
要使直线y=kx+1(k∈R)与焦点在x轴上的椭圆
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+
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=1总有公共点,实数a的取值范围是( )
A.0<a≤1
B.0<a<7
C.1≤a<7
D.1<a≤7
考点分析:
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