2005x^2-(2005^2-1)x-2005用换元法解_数学解答

2005x^2-(2005^2-1)x-2005用换元法解

人气：260 ℃　时间：2020-05-13 02:01:32

解答

令y=2005
yx^2 - (y^2 -1 )x-y
= yx^2 - y^2 * x +x-y
= xy(x-y) + (x-y)
= (xy+1)(x-y)
= (2005x+1)(x-2005)