4x 3 x 2 x 5 0 July 8, 2019 16 32 64 128 X 2 4x 3 2x 5 0 2x 3 3x 2 4x 5 0 X 5 4x 3 x 2 4 0 5 2x log x 2 4x 3 x 1 0 X 3 8 )( x 2 4x 5 )= 0 4x 3 20x 2 x 5 0 X 3 4x )( x 1 )/( 2x 5 0 4x 5 x 7 với x 2 x 3 )= 0 4 x 4 x 4 x