The first question has nothing to do with X, which means that X can be eliminated. When x is less than 5, x-5 plus the absolute value is equivalent to 5-X, which is a constant of 6.

The second question, classification discussion, when x is less than 0, x=- 1. When x is greater than 0, 3x= 1 and x = 0.33333.

The third question, the absolute value is greater than or equal to 0, so calculate x-3=0, x+y-5=0, x-y= 1.

The fourth question, a point of A (absolute value of A)-a point of B (absolute value of B) is 2, indicating that A is positive and B is negative. So ab points

The value of (the absolute value of ab) =- 1.