Explications étape par étape:
[tex]a = \frac{(10 {}^{2} ) {}^{3} \times 10 {}^{ - 4} }{ {10}^{2} } \\ = \frac{10 {}^{6} \times 10 {}^{ - 4} }{10 {}^{2} } \\ = \frac{10 {}^{2} }{10 {}^{2} } \\ = 1[/tex]
[tex]b = \frac{( {10}^{ - 2}) {}^{3} \times 10 {}^{9} }{ {10}^{7} \times {10}^{3} } \\ = \frac{ {10}^{ - 6} \times {10}^{9} }{ {10}^{10} } \\ = \frac{10 {}^{3} }{10 {}^{10} } \\ = 10 {}^{3 - 10} = {10}^{ - 7} [/tex]
