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Exercício 4 – Resolva as operações a seguir:

a) +8 − 15 = ______________

b) −12 + 9 = ______________

c) −4 − 9 = _______________

d) +15 + 16 = _____________

e) +7 ∙ (−5) = _____________

f) (−9) ∙ (−7) = ______________

g) +10 ∙ (−1) = ______________

h) 125 ÷ (−5) = ______________

i) −75 ÷ (−25) = ____________​