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3. 下列哪一個選項中的方程式和 x2 = 9 沒有相同的解?(A)4x2 = 36 (B)(x+3)(x-3)=0 (C)x2+x = x+9 (D)x2+2x-9=0
問題詳情
3. 下列哪一個選項中的方程式和 x2 = 9 沒有相同的解?
(A)4x2 = 36
(B)(x+3)(x-3)=0
(C)x2+x = x+9
(D)x2+2x-9=0
參考答案
答案:D
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【評論內容】x2=9,x=3(D)選項x2+2x-9應為9+6-9=6
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