bonjour
2 / ( x + 5 ) = 5 / ( 2 x - 1 )
4 x - 2 = 5 x + 25
4 x - 5 x = 25 + 2
- x = 27
x = - 27
( 2 x - 1 ) / ( 4 x + 2 ) = ( x - 3 ) / ( 2 x + 5 )
4 x² - 2 x + 10 x - 5 = 4 x² - 12 x + x - 6
4 x² - 4 x² + 8 x + 11 x = - 6 + 5
19 x = - 1
x = - 1/19
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bonjour
2 / ( x + 5 ) = 5 / ( 2 x - 1 )
4 x - 2 = 5 x + 25
4 x - 5 x = 25 + 2
- x = 27
x = - 27
( 2 x - 1 ) / ( 4 x + 2 ) = ( x - 3 ) / ( 2 x + 5 )
4 x² - 2 x + 10 x - 5 = 4 x² - 12 x + x - 6
4 x² - 4 x² + 8 x + 11 x = - 6 + 5
19 x = - 1
x = - 1/19
Ça m’aide beaucoup :)