(- 2 (- 4 )- 9 5 20 July 8, 2019 16 32 64 128 3 4 x 2 5 )=- 9 20 2 √ 9 4 √ 5 √ 20 2 căn 9 4 căn 5 căn 20 2 5-9/4 2 4-5 9/2 8
