Bonjour,
[tex] \frac{10 {}^{7} }{10 {}^{4} } = \frac{10 \times 10 \times 10 \times 10 \times 10 \times 10 \times 10}{10 \times 10 \times 10 \times 10} = {10}^{3} [/tex]
[tex] \frac{ {10}^{3} }{10 {}^{5} } = \frac{10 \times 10 \times 10}{10 \times 10 \times 10 \times 10 \times 10} = {10}^{ - 2} [/tex]
[tex] \frac{10 {}^{2} \times 10 {}^{6} }{ {10}^{8} } = \frac{10 {}^{6 + 2} }{ {10}^{8} } = \frac{ {10}^{8} }{ {10}^{8} } = 1[/tex]
