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如图所示,过⊙O外一点A作一条直线与⊙O交于C,D两点,AB切⊙O于B,弦MN过...
如图所示,过⊙O外一点A作一条直线与⊙O交于C,D两点,AB切⊙O于B,弦MN过CD的中点P.已知AC=4,AB=6,则MP•NP=
.
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