Question

tìm x biet |x-2|=x

Answer 1

Xét x>_2=>x-2>_0=>/x-2/=x-2

=>/x-2/=x

=>x-2=x

=>x-x=2

=>0=2

=>Vô lí

Xét x<2=>x-2<0=>/x-2/=2-x

=>/x-2/=x

=>2-x=x

=>x+x=2

=>2x=2

=>x=1

Vậy x=1

Answer 2

=>x-2=x                   hoac x-2=-x

2=x-x=0(vô lí)          2 =x-(-x)=  x+x=2x

                                     x=1