Question

tìm STN  biết 

(x-6)⁶ = (x-6)⁸

Answer 1

(x-6)^6=(x-6)^8

=>(x-6)^6-(x-6)^8=0

=>[(x-6)^6]*1-(x-6)^6*(x-6)^2=0

=>(x-6)^6*[1-(x-6)^2]=0

=>[(x-6)^6=0       =>[x-6=0           =>[x=0+6       =>[x=6

     [1-(x-6)^2=0       [(x-6)^2=1-0      [(x-6)^2=1      [(x-6)^2=(+-1)^6

=>[x=6                         =>[x=6

    [x-6=1 hoac x-6=-1      [x=1+6=7 hoac x=-1+6=5

Vay x={5,6,7} tiiiiiiiiiiiiiiiiiiiiiiiiiiiicccccccccccccckkkkkkkkkkkkkkkkkk