BT3 : a, ( 2x + 1 )( 3x - 2) = ( 5x -8 )( 2x + 1 ) b, ( x + 1 )2 = 4( x2 - 2x + 1) c, 4x2 - 1 = ( 2x + 1 )( 3x - 5 ) d , x2 + 17 -18
Đăng ký qua Facebook hoặc Google: