Cho dãy số: 1,2,3,4…1993,1994. Một Hs tiến hành công việc như sau: xóa đi hai số bất kỳ trong các số đó rồi viết thay vào giá trị tuyệt đối của hiệu hai số đã xóa, sau đó lặp lại công việc cho đến khi trên bảng chỉ còn lại một số. Hãy chứng tỏ rằng số cuối cùng trên bảng không thể là số 0. giúp em với huhu!!

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