x-1的绝对值+x+2的绝对值<5 2x-1的绝对值-x<x+3的绝对值+1
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{|x-1|+|x+2|<5
①
{|2x-1|-x<|x+3|+1
②
①与②的公共零点是:
x=-3,-2,(1/2);
1
(1)
当x<
-3时,原不等式组为:
{1-x-2-x<5
{1-2x-x<-x-3+1
{x>-3
{x>1/2
无解!
.......................................................
(2)
当-3≤x<-2时,原不等式组为:
{1-x-2-x<5
{1-2x-x
-3
{x>-3/4
==>x>-3/4无解!
...............................................................
(3)
当-2≤x<1/2时,原不等组为;
{1-x+x+2<5
{1-2x-x
-3/4
==>-3/4
1/2≤x<1
...............................................................
(5)
当x≥1时,原不等式组为:
{x-1+x+2<5
{2x-1-x
1≤x<2
===============================
综合可知:
-3/4
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①
{|2x-1|-x<|x+3|+1
②
①与②的公共零点是:
x=-3,-2,(1/2);
1
(1)
当x<
-3时,原不等式组为:
{1-x-2-x<5
{1-2x-x<-x-3+1
{x>-3
{x>1/2
无解!
.......................................................
(2)
当-3≤x<-2时,原不等式组为:
{1-x-2-x<5
{1-2x-x
-3
{x>-3/4
==>x>-3/4无解!
...............................................................
(3)
当-2≤x<1/2时,原不等组为;
{1-x+x+2<5
{1-2x-x
-3/4
==>-3/4
1/2≤x<1
...............................................................
(5)
当x≥1时,原不等式组为:
{x-1+x+2<5
{2x-1-x
1≤x<2
===============================
综合可知:
-3/4
评论
0
0
0
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