急问 is |x|<1? 谢!!!

oscarwang

题目:   is |x|<1?

          (1) |x+1|=2|x-1|

          (2)|x-3|不等于0

答案是 c.望请解答并给出详细步骤.

谢谢!!!!!!!!!!!!!!!!!

oscarwang

请问怎么解两边都有绝对值的等式??