11. 設x2 + px + q =( x + m)( x + n) ,若m﹤0 ﹤n,則下列何者不一定正確?(A)p = m + n(B)p﹤0 (C)q﹤0 (D)q = m✖n
【Wen Zhi Li】評論
(x+m)(x+n)=x2+(m+n)x+☆☆☆=☆+☆,........