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Nếu chuyển dấu phẩy của số thập phân A sang bên trái một chữ số thì được số thập phân B.=> A:10=B
=> A=B.10
Theo bài ra ta có: A-B=18,081
=> B.10-B=18,081
=> B.9=18,081
=> B=18,081:9
=> B=2,009
=> A=2,009.10
=> A=20,09
Vậy A=20,09
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Do dời dấu phẩy của A sang phải được B nên B = 10 × A
Tổng số phần bằng nhau:
10 + 1 = 11 (phần)
Số A là: 13,7 : 11 × 1 = 1,2(45)