Question

如何去绝对符号？例如：｜x-2｜<=3

Answer 1

当x-2>=0时直接去掉绝对值符号，则有x-2<=3，解得x<=5;
当x-2<0时|x-2|=-(x-2),于是有-(x-2)<=3,解得x>=-1;
综上得，-1<=x<=5

Answer 2

去除绝对值符号，主要是要考虑其正、负两种情况。如│x-2│≤3，即：-3≤x-2≤3
得：-1≤x≤5

Answer 3

-3<=x-2<=3
-1<=x<=5

Answer 4

-3<=(X-2)<=3

Answer 5

-3<=X-2<=3
解得：-1<=X<=5