December 2019 1 23 Report
2.Calcule

a) (+15)+(+9)=
b) (-22)+(+31)=
c) (-13)+(-15)=
d) (+29)+(+41)=
e) (-36)+(+17)=
f) (+31)+(-19)=
g) +5 +7=
h) +2 -16=
i) -12 -29=
j) -57 +17=
k) +89 -21=
l) -100 -10
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