Tìm x biết rằng
tìm x biết
(2x- 5) (2x + 5) - 4x( x-3)= 11
(3x- 7) (3x= 7) - 9x (x+ 2)= 26
(4x- 5 )^2- (4x- 3) (4x+ 3) =154
(6x- 7) ^2 - 4(3x- 2) (3x+2) =401
(2x- 5) (2x + 5) - 4x( x-3)= 11
(3x- 7) (3x= 7) - 9x (x+ 2)= 26
(4x- 5 )^2- (4x- 3) (4x+ 3) =154
(6x- 7) ^2 - 4(3x- 2) (3x+2) =401