Question

Tìm x:

-2x^2+x=0

9x^2- (2x-1)^2=0

Answer 1

a: =>2x²-x=0

=>x(2x-1)=0

=>x=0 hoặc x=1/2

b: =>(3x-2x+1)(3x+2x-1)=0

=>(x+1)(5x-1)=0

=>x=-1 hoặc x=1/5