December 2019 1 61 Report
Calcule:

a) 6 - (-2)
b) 5 - (+1)
c) 9 - (+9)
d) -7 - (-5)
e) -9 - (++1)
f) 89 - (-11)
g) 2,4 - (-3)
h) -0,5 - (-0,5)
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