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2023-09-19 19:51:37
1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 + ... + 298 - 299 - 300
1 + 2 + ( 5 - 3 ) + ( 6 - 4 ) + ( 9 - 7 ) + ( 10 - 8 ) + ... + ( 300 - 298 )
Từ 300 đến 3 có số cặp là [ ( 300 - 3 ) : 1 + 1 ] : 2 = 149 cặp. Mà mỗi cặp có giá trị là 2 .
Vậy 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 + ... + 298 - 299 - 300
1 + 2 + 2 × 149 = 3 + 298 = 301