bonjour
A = ( 5 x - 1 )² + ( 5 x - 1 ) ( x + 3 )
A = ( 5 x - 1 ) ( 5 x - 1 + x + 3 )
= ( 5 x - 1 ) ( 6 x + 2 )
si x = 4/5
= ( 20/5 - 5/5 ) ( 24/5 + 10 /5 )
= 15/5 * 34 /5
= 3 *34/5
= 102/5
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bonjour
A = ( 5 x - 1 )² + ( 5 x - 1 ) ( x + 3 )
A = ( 5 x - 1 ) ( 5 x - 1 + x + 3 )
= ( 5 x - 1 ) ( 6 x + 2 )
si x = 4/5
= ( 20/5 - 5/5 ) ( 24/5 + 10 /5 )
= 15/5 * 34 /5
= 3 *34/5
= 102/5