問題詳情
8. 下列敘述何者正確?
(A)若( x－2) ( x－3 ) ＝1，則因為1×1＝1， 所以x－2＝1或x－3＝1 
(B)若方程式ax2＋2bx＋c＝0有重根，則b2－ac＝0
(C)利用公式法解方程式3x2－x－4＝0時，b2－4ac＝12－4×3×4＝1－48＝－47，故方程式無實數解
(D)若x2＋mx＋49是完全平方式，則m＝14
參考答案
答案：B
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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