(x-1)/(x-2)>0,
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(x-1)/(x-2)>0,
(x-1)/(x-2)>0,
(x-1)/(x-2)>0,
两边乘(x-2)²
显然(x-2)²>0
所以(x-1)(x-2)>0
x<1,x>2
x<1或x>2,满意吗?
一个“整式的乘法”的问题请先阅读下列解题过程,再仿做下面的问题.已知X*X + X - 1=0,求X*X*X + 2*X*X + 3的值.解X*X*X + 2X*X +3=X*X*X +X*X -X +X*X +X +3=X{X*X +X -1} +X*X +X -1 +4=0+0+4=4+ x + X*X + X*X*X=0.+ X*X + X*X*X
如果X*X--1=0,那么X*X*X+2*X*X+2008=几?
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(x-1)/(x-2)>0,
(x+1)(x+2)0