下列一元二次方程式的敘述,何者正確?(A) -2x2-x+1=0有相異兩根。 (B)x2+x+1=0有重根。(C) x2-x-1=0無解。 (D)x2+2x+3=0有相異兩根

問題詳情

9.下列一元二次方程式的敘述,何者正確?
(A) -2x2-x+1=0有相異兩根。
(B)x2+x+1=0有重根。
(C) x2-x-1=0無解。
(D)x2+2x+3=0有相異兩根

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