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（1）直线l与抛物线y 2 =8x交于A，B两点，且l经过抛物线的焦点F，已知A（8，8），则线段AB的中点到准线的距离为______ （2）已知A（4，1，3），B（2，3，1），C（3，7，-5），点P（x，-1，3）在平面ABC内，则x=______．
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