Lời giải:
Báo sai\(\begin{array}{*{20}{l}} {\left( { - 7} \right) + 1100 + \left( { - 13} \right) + \left( { - 1100} \right)}\\ { = \left[ {\left( { - 7} \right) + \left( { - 13} \right)} \right] + \left[ {1100 + \left( { - 1100} \right)} \right]}\\ { = - 20 + 0}\\ { = - 20} \end{array}\)
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