1.|1/2x|+2=6 3.|3-2x|4 5.|2x-1/5|1/2 7.1
题目
1.|1/2x|+2=6 3.|3-2x|4 5.|2x-1/5|1/2 7.1
答案
1.|1/2x|+2<5
=>-3<1/2x<3
=>-1/6
如果是x*1/2
答案是
-6
2.|3x|-2>=6
=>3x>8,3x<-8
=>x>8/3,x<-8/3
3.|3-2x|<=3
=>-3<=3-2x<=3
=>-6<=-2x<=0
=>0<=x<=3
4.|2x-3|>4
=>2x-3>4,2x-3<-4
=>2x>7,2x<-1
=>x>7/2,x<-1/2
5.|2x-1/5|<=1/3
-1/3<=2x-1/5<=1/3
-2/15<=2x<=8/15
-1/15<=x<=4/15
6.|1/2+3|>1/2
没有x
7.1<|2x-1|<=3
=>2x-1>1,2x-1<-1且-3<2x-1<3
=>x>1,x<0,且-1
=>-1
8.2<=|3-2x|<5
=>3-2x>=2,3-2x<=-2,且-5<3-2x<5
=>x<=1/2,x>=5/2且-1
=>-1
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