若x的平方-5x-2008=0,则分式x-2分之(x-2)的平方-(x-1)的平方+1的值为?

要具体过程哦
2024-12-30 23:33:51
推荐回答(2个)
回答1:

此题答案为-2,与x的值无关。(在x-2不等于0的前提下)
(x-2)2-(x-1)2+1
--------------------------
x-2
x2-4x+4-x2+2x-1+1
=------------------------------
x-2
-2x-4
=----------------------------------
x-2
-2(x-2)
=-----------------------------------
x-2
=-2
呵呵抱歉,过程貌似不太好写

回答2:

x^2-5x=2008
显然 x≠2
那么,原分式就是:
((x-2)^2-(x-1)^2+1)/(x-2)
=(x-2)-(x^2-2x)/(x-2)
=(x-2)-x
=-2