bonjour
donc le 4
A = 3 / ( 3 √2 - √3 )
A = 3 ( 3 √2 + √3) / ( 3 √2 - √3) ( 3√2 + √3)
A = (9 √2 + 3 √3 ) / 18 - 3
A = ( 9 √2 + 3 √3) / 15
A = ( 3 √2 + √3) / 5
B = ( 3 √2 + √3) / 5
A/B = ( 3 √2 + √3) / 5 x 5 / ( 3 √2 + √3 )
A/B = (15 √2 + 5 √3 ) /( 15 √2 + 5 √3 ) = 1