bonjour
1 ) 11 est la valeur interdite
donc ( 2 x + 3 ) ( 2 - x ) ( 7 - 4 x ) = 0
S ( - 3/2 ; 2 ; 7/4 )
2 ) 3 x² - 5 x + 5 = - x² + 7 x - 4
3 x² + x² - 5 x - 7 x = - 4 - 5
4 x² - 12 x = - 9
4 x² - 12 x + 9 = 0
( 2 x - 3 ) ² = 0
x = 3/2
3 ) ( 2 x - 1 ) ( 2 x - 7 ) = ( 2 x - 1 ) ( 4 - x )
( 2 x - 1 ) ( 2 x - 7) - ( 2 x - 1 ) ( 4 - x ) = 0
( 2 x - 1 ) ( 2 x - 7 - 4 + x ) = 0
( 2 x - 1 ) ( 3 x - 11 ) = 0
x = 1/2 ou 11/3
( x² + 6 ) / ( x - 3 ) - 4 ( x - 3 ) / x - 3 ) = 0
( x² + 6 - 4 x + 12 ) / ( x - 3 ) = 0
( x² - 4 x + 18 ) / ( x - 3 ) = 0
delta négatif, pas de solution
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bonjour
1 ) 11 est la valeur interdite
donc ( 2 x + 3 ) ( 2 - x ) ( 7 - 4 x ) = 0
S ( - 3/2 ; 2 ; 7/4 )
2 ) 3 x² - 5 x + 5 = - x² + 7 x - 4
3 x² + x² - 5 x - 7 x = - 4 - 5
4 x² - 12 x = - 9
4 x² - 12 x + 9 = 0
( 2 x - 3 ) ² = 0
x = 3/2
3 ) ( 2 x - 1 ) ( 2 x - 7 ) = ( 2 x - 1 ) ( 4 - x )
( 2 x - 1 ) ( 2 x - 7) - ( 2 x - 1 ) ( 4 - x ) = 0
( 2 x - 1 ) ( 2 x - 7 - 4 + x ) = 0
( 2 x - 1 ) ( 3 x - 11 ) = 0
x = 1/2 ou 11/3
( x² + 6 ) / ( x - 3 ) - 4 ( x - 3 ) / x - 3 ) = 0
( x² + 6 - 4 x + 12 ) / ( x - 3 ) = 0
( x² - 4 x + 18 ) / ( x - 3 ) = 0
delta négatif, pas de solution