5 1 4x )- 2 =- 13 July 8, 2019 16 32 64 128 5 x 1 )= 4x 2 x 13 5 2 4x 1 )+ 3x 13 3x 2 13x 5 4x 1 4x 2 5 căn 3x 1 13x 13 5 4x 1 2x 14 2 5x 3x 10