摘要：030]解:(1).．····················································· (2)①当的圆心由点向左运动.使点到点并随继续向左运动时. 有.即． 当点在点左侧时.过点作射线.垂足为.则由. 得.则．解得． 由.即.解得． 当与射线有公共点时.的取值范围为．··························· ②当时.过作轴.垂足为.有 ．.即． 解得．····································· 当时.有. ．解得．·························· 当时.有 ． .即． 解得．························································· 当是等腰三角形时..或.或.或．···············

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