chx buồn ngủ

có

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:(

6666,7 máy tính ra thế

Ta có:

\(A = 1 - 2 + 3 - 4 + \hdots + 2021 - 2022\)

Nhóm các hạng tử theo cặp:

\(\left(\right. 1 - 2 \left.\right) + \left(\right. 3 - 4 \left.\right) + \hdots + \left(\right. 2021 - 2022 \left.\right)\)

Mỗi cặp đều bằng:

\(1 - 2 = - 1 , 3 - 4 = - 1 , \&\text{nbsp}; \ldots\)

Số cặp là:

\(\frac{2022}{2} = 1011\)

Vậy:

\(A = 1011 \times \left(\right. - 1 \left.\right) = - 1011\)

Kết quả: \(\boxed{- 1011}\) đây nha !

hi

đây

?