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9.下列方程式中,何者的解是無解?(A) 9x2-6x+1=0 (B) 2x2-2x+4=0(C) x2+4x-4=0 (D) x2-9=0 。
問題詳情
9.下列方程式中,何者的解是無解?
(A) 9x2-6x+1=0
(B) 2x
2-2x+4=0
(C) x
2+4x-4=0
(D) x
2-9=0 。
參考答案
答案:B
難度:
計算中
-1
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用户評論
【
Marvin
】評論
b2-4ac<0 =>無解(☆) 2☆2-2☆+4=0...
上一篇 :
8.一直角三角形的斜邊長為20公分,兩股差為4公分,則此直角三角形的面積為?(A)86 (B)90 (C)96 (D)100
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