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平面的法向量是(1,2,1)設該點是(t,t^2,t^3),則切線向量是(1,2t,3t^2),與平面法向量垂直,則1+2*2t+3t^2=0,t1=-1,t2=-(1/3).所以該點是(-1,1,-1)與(-1/3,1/9,-1/27)
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