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在抛物線線y^2= -2px中,焦點是(-p/2,0),準線的方程是x=p/2 得到p=6 所以抛物線y^2=-12x的焦點是(-3,0)準線是x=3 所以抛物線y的平方=-12x的焦點到準線的距離是p=6
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