S2S2 思賢与舒忆问的12e Q27

你们问的这题,你们是对的!我设想错误。
应该是,
let (at^2+3,2at) 不是 (at^2,2at), 因为它的顶点不在(0,0) 而是在(3,0)。
有时间,我再post新的解答在这里。
谢谢你们的提问与提醒!

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