bonsoir
F = 7 ³ * a⁻⁵ b x ( ab ³) ³ : 49 x a ⁵ x b ⁻⁴
= 7 ³ * a ⁻⁵ * b * a⁹ * b ⁹ ; 7 ² * a⁵ * b ⁻⁴
= a ⁴ * b ¹⁰ * 7 ³ : a⁵ * b ⁻⁴ * 7 ²
= a ⁻¹ * b ¹⁴ * 7 ¹
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bonsoir
F = 7 ³ * a⁻⁵ b x ( ab ³) ³ : 49 x a ⁵ x b ⁻⁴
= 7 ³ * a ⁻⁵ * b * a⁹ * b ⁹ ; 7 ² * a⁵ * b ⁻⁴
= a ⁴ * b ¹⁰ * 7 ³ : a⁵ * b ⁻⁴ * 7 ²
= a ⁻¹ * b ¹⁴ * 7 ¹