Réponse:
a)
[tex]789 \times 10^{4} \\ 7.89 \times 10^{2} \times {10}^{4} \\ 7.89 \times {10}^{6} [/tex]
b)
[tex]0.67 \times {10}^{ - 3} \\ 6.7 \times 10 {}^{ - 1} \times 10 {}^{ - 3} \\ 6.7 \times 10 {}^{ - 4} [/tex]
c)
[tex]0.003 \times {10}^{6} \\ 3 \times {10}^{ - 3} \times 10 {}^{6} \\ 3 \times {10}^{3} [/tex]
d)
[tex]12.8 \times {10}^{ - 1} \\ 1.28 \times 10 {}^{1} \times {10}^{ - 1} \\ 1.28 \times 10 {}^{0} [/tex]
