【評論主題】6.因式分解4x2 -y2 +2y-1的結果為何? (A) (2x+y-1)(2x-y+1) (B) (2x-y-1)2 (C) (2x+y-1)(2x-y-1) (D) (2x+y+1)(2x-y
【評論內容】原式最後一數字為「-1」可推知為「(1)☆(-1...