練習題庫/huikao・難度 3解方程式 7x+2=3x2+2x+17x+2=3x^2+2x+17x+2=3x2+2x+1，將解題紀錄依序記為「二次項係數為正的標準式、判別式 DDD、實數解」。下列哪一份紀錄完全正確？(A)3x2−5x+1=03x^2-5x+1=03x2−5x+1=0；D=13D=13D=13；x=5±136x=\frac{5\pm\sqrt{13}}{6}x=65±13(B)3x2−5x−1=03x^2-5x-1=03x2−5x−1=0；D=37D=37D=37；x=5±376x=\frac{5\pm\sqrt{37}}{6}x=65±37(C)3x2−5x−1=03x^2-5x-1=03x2−5x−1=0；D=13D=13D=13；x=5±136x=\frac{5\pm\sqrt{13}}{6}x=65±13(D)3x2−5x−1=03x^2-5x-1=03x2−5x−1=0；D=37D=37D=37；x=−5±376x=\frac{-5\pm\sqrt{37}}{6}x=6−5±37(E)3x2−5x−1=03x^2-5x-1=03x2−5x−1=0；D=37D=37D=37；x=5±373x=\frac{5\pm\sqrt{37}}{3}x=35±37登入後即可作答並查看完整詳解（每日免費 5 題）。