Question

(-18)+(+20)=
(+38)+(-39)=
(+21)+(-4)=
(+56)+(+2)=
(+5)+(-89)=

Answer 1

(-18)+(+20)=-18+20=3

(+38)+(-39)=38-39=-1

(+21)+(-4)=21-4=17

(+56)+(+2)=56+2=58

(+5)+(-89)=5-89=-84


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espero ter ajudado!

boa tarde!