4 x 6 ) 2 6x 6 July 8, 2019 16 32 64 128 4 x 6 )+ 2 6x 6 (- 6x 2 x 6 )-( 4x 2 6x 4 X 2 6x 9 4 căn x 2 6x 6 X 2 6x 9 4 √ x 2 6x 6 6 + 4 = 4
