Efetue as operações com números internos.

a) (+4)+(-3)=

b) (-6)+(+9)=

c) (+8)-(+2)=

d) (-1)-(-7)=

e) (+3)•(+7)=

f) (-2)•(+6)=

g) (+45)÷(-3)=

h) (-24)÷(-6)=​
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