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此抛物線的標準方程為x²;=1/a·y.準線方程是y=2.可判斷此抛物線開口向下,∴a為負數,且|1/a|=2p.p為焦准距,焦點座標(0,-2)∴p=4.則|1/a|=8,可求出a=-1/8 希望我的回答給您帶來幫助,祝學習愉快
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