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Sagot :

Explications étape par étape:

[tex] 7 {}^{4} \times 7 {}^{3} \times 7 {}^{ - 1} = 7 {}^{(4 + 3 - 1)} \\ = 7 {}^{6} \ \\ \\ \\ \ 3 {}^{ - 2} \times 3 {}^{8} \times 3 {}^{ - 10} = 3 {}^{( - 2 + 8 - 10)} \\ = 3 {}^{ - 4} [/tex]

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