Question

Tìm x

Ix-1I=x

Ix-1I=x+3

ai nhanh mk tck

Answer 1

a) Vì x-1#x

=>x-1=-x

=>x+x=1

=>x=¹/₂

Vậy x=¹/₂

b)TH1:x-1=x+3

=>x-x=1+3

=>0=2(vô lí)

TH2:x-1=-(x+3)

=>x-1=-x-3

=>x+x=1-3

=>2x=-2

=>x=-1

Vậy x=-1