摘要:已知圆C1: x2 + y2 + 2x-2y + 1 = 0,圆C2: x2 + y2-4x-2y +1 = 0.圆心分别为C1.C2.两圆外公切线交于点P.若 = λ则λ等于 ( ) A. B.- C.-2 D. 2

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