AJUDA PF.

Resolva:

a) -10 + 7 _____

b) -13 + 15 _____

c) a + a _____

d) +10 - 7 _____

e) +13 - 15 _____

f) -a - a _____

g) -10 - 7 _____

h) -13 - 15 _____

i) - a + a _____

j) -3a + 5a _____

k) -6a + 2a _____

l) -3a - 5a _____
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