\( - 1 - 2 - 3 - 4 - ... - 2008 - 2009 - 2010\)
\( = - \left( {1 + 2 + 3 + ... + 2008 + 2009 + 2010} \right) = \frac{{\left( {1 + 2010} \right).2010}}{2} = - 2021055\)
Thu gọn các tổng sau:
\[\left( {a - b + c - d} \right) - \left( {a + b + c + d} \right)\]