Ayudenme porfa efectua las siguientes adiciones
a) (+3)+(+12)
b) (-15)+(+28)
c) (-6)+(-19)+(-7)
d) (+16)+(+28)+(+12)
a) (+3)+(+12)
b) (-15)+(+28)
c) (-6)+(-19)+(-7)
d) (+16)+(+28)+(+12)
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3+12
= 15
b) (-15)+(+28)
-15+28
= 13
c) (-6)+(-19)+(-7)
-6-19-7
= -32
d) (+16)+(+28)+(+12)
16+28+12
= 56