a) 0,5x ( x - 3) = ( x -3 ) (2,5x - 4)
Giải thích
0,5x ( x - 3) = ( x -3 ) (2,5x - 4)⇒0,5x ( x - 3) - ( x -3 ) (2,5x - 4) = 0⇒( x - 3 ) (2,5x - 0,5x - 4 ) = 0⇒ ( x- 3 ) ( 2x - 4 ) = 0⇒ x = 3 hoặc x = 2
0,5x ( x - 3) = ( x -3 ) (2,5x - 4)⇒0,5x ( x - 3) - ( x -3 ) (2,5x - 4) = 0⇒( x - 3 ) (2,5x - 0,5x - 4 ) = 0⇒ ( x- 3 ) ( 2x - 4 ) = 0⇒ x = 3 hoặc x = 2