2 3 1 5 x 10 7 July 8, 2019 16 32 64 128 3 1 2 x )- 5 x 1 10 )=- 7 4 2 x 1 )/ 5 3 x 1 )/ 10 7x 1 10 2 3 nhân x 1 5 7 10 2 3x 5 x 7 10 3 2x 1 2 3 x 9 5 )- 3 10 5x 1 3 )= 7 15 7 2x 3 )+ 2 x 1 )- 5 x 9 )= 3x 10 2/5 + 3/10 2 3 5 7 x 13