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作者 DeadLock 在 PTT [ tutor ] 看板的留言(推文), 共4則
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13F推:把 x=a & x=2-a 代入f(x) 解得 a=1 or -1 or 308/21 01:26
14F→:所以兩根和為二 有 (1,1) & (-1,3) 兩種08/21 01:27
15F→:由f(x)係數可以發現 (1,1)這組根不合 所以是(-1,3)08/21 01:27
16F→:然後除一除就知道剩下的兩根是1and-508/21 01:28
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