1 2x x 2 20 July 8, 2019 16 32 64 128 Let 1 x 2x 2 20 1 2x 2018 x 2 2019 2 5 1 1 2x )- 2 x 20 4x2 2x 1 4 x 2 2x 20 If 1 x 2x 2 20 a0 a1x Let 1 x 2x 2 20 a0 a1x Xét khai triển 1 2x x 2 20 X 2 + 2x 1 = x 2 2023 1 2x 4 x 2 )= 14 2x 20 4 2x 1 )- 3 x 2 )= 20 3x 10 2x 1 15 2 x 20
