Question

解方程X+3的绝对值-X+1的绝对值=X+1.

Answer 1

|x+3|-|x+1|=x+1

|x+3|=x+3

|x+1|=x+1

x+3-x-1=x+1

2=x+1

x=1

验算过,绝对正确,