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一道PREP DS 题目 43. 3416-!-item-!-187;#058&003281 Circle C and line k lie in the xy-plane. If circle C is centered at the origin and has radius 1, does line k intersect circle C ?
(1) The x-intercept of line k is greater than 1.
(2) The slope of line k is -
. --------------------------------------------------------------------------------------------------------------------------------------------------------【答案】E 【思路】
(1) 需要知道兩點才行----------------------------------------------------------------- insufficient (2) slope為負,左上右下無法判斷------------------------------------------------------insufficient (1)(2)--------------------------------------------------------------------------------------insufficient 我觉得应该是选c, 因为有截距（大于1）和斜率（负1/10), 可以知道相交情况的啊？ | 
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发表于 2009-5-18 20:40:00
