(3x²;-2x-1)÷(x-1)=(

(3x²;-2x-1)÷(x-1)=(

x≠1時
(3x²;-2x-1)÷(x-1)
=(3x+1)(x-1)÷(x-1)第一步因式分解,3x²;-2x-1分解成(3x+1)(x-1)
=3x+1
x=1時,分母為0,無意義