Question

[phuong nguyen hoai]

1.2.3...8.9 -1.2.3...8 -1.2.3...8.8

Answer 1

[Nguyễn Thị Hồng Nhung]

\(1.2.3...8.9-1.2.3...8-1.2.3...8.8\\ =1.2.3.4...7\left(9-1-8\right)\\ =0.1.2...7=0\)

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