Réponse :
bonjour
A = ( √a + √b) ²
A = a + 2 √ab + b
B = ( √a - √b ) ²
B = a - 2 √ab + b
A + B = a + 2 √ab + b + a - 2 √ab + b = 2 a + 2 b
A - B = a + 2 √ab + b - ( a - 2 √ab + b ) = a + 2 √ab + b - a + 2 √ab - b
= 4 √ab
AB = ( √a + √b ) ( √a - √b ) = a - b
Explications étape par étape
