bonjour
( 2 x - 1 ) ( x + 3 ) + ( x + 5 ) ( 2 x - 1 ) = 0
( 2 x - 1 ) ( x + 3 + x + 5 ) = 0
( 2 x - 1 ) ( 2 x + 8 ) = 0
x = 1/2 ou - 8/2 = - 4
5 x ( 3 x + 2 ) = ( 3 x + 2 )²
5 x ( 3 x + 2 ) - ( 3 x + 2 )² = 0
( 3 x + 2 ) ( 5 - ( 3 x + 2 ) = 0
( 3 x + 2 ) ( 5 - 3 x - 2 ) = 0
( 3 x + 2 ) ( - 3 x + 3 ) = 0
x = - 2/3 ou 1
1 ) A = 1 - 2 / ( x +1 )
A = 1 ( x + 1 ) - 2 / ( x + 1 )
A = ( x + 1 ) / ( x +1 ) - 2 / ( x + 1 )
A = ( x + 1 - 2 ) / ( x + 1 )
A = ( x - 1 ) / ( x + 1 )
2 ) [2 x / ( x + 1) ] - 1
= 2 x / ( x + 1) - 1 ( x + 1 ) / ( x+ 1 )
= ( 2 x - x - 1 ) / ( x + 1 )
= x - 1 / x + 1
( √ 3 - 1 ) / ( √3 + 1 )
= ( √3 - 1 ) ² / ( √3 + 1 ) ( √3 - 1 )
= 9 - 2 √3 + 1 / 3 - 1
= 10 - 2 √3 / 2
= 5 - √3
allez termine
