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过抛物线y2=2x的焦点作直线交抛物线于P(x1,y1),Q(x2,y2)两点,...
过抛物线y2=2x的焦点作直线交抛物线于P(x1,y1),Q(x2,y2)两点,若x1+x2=3,则|PQ|= .
考点分析:
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