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bonjour

A =  5 ⁸ * 5 ⁻⁶ : 5 ⁻⁷

A =  5 ² : 5 ⁻⁷

A = 5 ⁹

B =  ( 2 x 5 )² x ( 5²) ⁻³ x ( 2² x 5 ) ⁴

  = 2 ² * 5 ²  * 5 ⁻⁶ * 2⁸ * 5 ⁴

=  2 ¹⁰ * 5 ⁰

= 2 ¹⁰

C =  ( 100 - 25 ) * 4 = 75 * 4 = 300 = 3 * 10 ²

allez finis

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