(文)如果直線l將圓x2+y2-2x-4y=0平分,且不通過第四象限,則直線l的斜率的取值范圍是

[  ]
A.

[0,1]

B.

[,1]

C.

[0,]

D.

[0,2]

答案:D
解析:

由題意知l過圓心(1,2),由圖知k∈[0,2].


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