设a＞0，b＞0，若点P（1，1）到直线（a+1）x+（b+1）y﹣2=0的距离为1，则ab的取值范围是_刷题宝

题干

设a＞0，b＞0，若点P（1，1）到直线（a+1）x+（b+1）y﹣2=0的距离为1，则ab的取值范围是（　　）

A： $\sqrt{2}$ -1,+ $\infty$ )

B：3-2 $\sqrt{2}$ ,+ $\infty$ )

C：1+ $\sqrt{2}$ ,,+ $\infty$ )

D：3+2 $\sqrt{2}$ ,+ $\infty$ )

上一题下一题 0.0难度选择题更新时间:2017-11-29 09:54:24

答案(点此获取答案解析）

D

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