Question

几道绝对值的题|x-1|=0 x=_____|b|-|5|=0 b=_____|x-4|+|y-5|=0 x=_____

Answer 1

1,x=1

2,b=+-5

3,x=4,y=5

4,a+b=+-5

5,a-b=+-3 a和b有无数个解