X 3 3x 2 9 3 x 5 July 8, 2019 16 32 64 128 X 2 3x 9 )( x 3 )-( 54 x 3 Rút gọn x 3 )( x 2 3x 9 )-( 54 x 3 2 x 3 3 x 3 3x 5 x2 9 3 x 3 = 9 3 x-5=x+3
