December 2023 1 9 Report
Calcula.
a) 5 − 7 + 19 − 20 + 4 − 3 + 10 =
b) −(8 + 9 − 11) =
c) 9 − 11 + 13 + 2 − 4 − 5 + 9 =
d) −(20 + 17) − 16 + 7 − 15 + 3 =

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