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由抛物線的定義知,M的軌跡是一條抛物線,焦點為F(0,1),準線為y=-1,所以p=2 抛物線的標準方程為x²;=2py=4y 即動點M(x,y)的軌跡方程是x²;=4y,這是一條對稱軸是y軸,焦點為F(0,1),開口向上的抛物線.
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