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=1内一点M(2,1)引一条弦,使得弦被M点平分,求此弦所在的直线方程.已知△ABC的三个顶点A,B,C及平面内一点P满足: PA+ PB+ PC= 0,若实数λ 满足: AB+ AC=λ AP,则λ的值为( ) A、3 B、 2 3 C、2 D、8违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com 精英家教网 ...