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Resposta:

[tex]a) \: 8.3 \times {10}^{ - 4} \\ b) \: 4.7 \times {10}^{ - 3} \\ c) \: 1.85 \times {10}^{ - 4} \\ d) \: 7.9 \times {10}^{ - 7} \\ e) \: 3.6 \times {10}^{ - 2} [/tex]

bons estudos! =)