bonsoir
A = ( √7 - √5 ) / √2
A = ( √7 - √5 ) ( √2) / ( √2)²
A = √14 - √10 / 2
B = √2 / ( √7 + √5 )
B = √2 ( √7 - √5 ) / ( √7 + √5 ) ( √7 - √5 )
B = √14 - √10 / 7 - 5
B = √14 - √10 / 2
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bonsoir
A = ( √7 - √5 ) / √2
A = ( √7 - √5 ) ( √2) / ( √2)²
A = √14 - √10 / 2
B = √2 / ( √7 + √5 )
B = √2 ( √7 - √5 ) / ( √7 + √5 ) ( √7 - √5 )
B = √14 - √10 / 7 - 5
B = √14 - √10 / 2