Bài 1 : Tìm x : ( 2x – 4 )² = ( 2x – 4 )³

2 bình luận về “Bài 1 : Tìm x : ( 2x – 4 )² = ( 2x – 4 )³”

1. @Zy. $\\$

   $#Bạn tham khảo.$ $\\$

   $\underline{Bài 1 :}$ Tìm x : $\\$

   ( 2x – 4 )² = ( 2x – 4 )³

   ( 2x – 4 )² = ( 2x – 4 )² . ( 2x – 4 )

   ( 2x – 4 )² . ( 2x – 4 ) – ( 2x – 4 )² = 0

   ( 2x – 4 )² . [( 2x – 4 ) – 1] = 0

   => ( 2x – 4 )² = 0 hoặc 2x – 5 = 0

   ( 2x – 4 )² = 0

   ( 2x – 4 )² = 0²

   2x – 4 = 0

   2x = 0 + 4

   2x = 4

   x = 4 : 2

   x = 2

   Vậy x = 2.

   _______________________

   @Zinkcjhet57.

   #hoidap247.

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2. ????????????????????????????????????????????????????

   $\bullet$  (2x-4)^2=(2x-4)^3 (x in N)

   (2x-4)^2-(2x-4)^3=0

   (2x-4)^2 . [1-(2x-4)]=0

   (2x-4)^2 . (1-2x+4)=0

   (2x-4)^2 . (5-2x)=0

   2x-4=0 hoặc 5-2x=0

   2x=4 hoặc 2x=5

   x=2 hoặc x=5/2 (ko tm)

   Vậy x =2

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