bonjour
√ 3 x √3 - √ (- 5 )² = 3 - 5 = - 2
( 2 + √5 ) ( 2 - √5) = identité remarquable
= 2 - 5 = - 3
2 ( 3 √2)² = 2 ( 18) = 36
√25/16 - ( - 2 √2 ) ²
= 5/4 - 8 = 5/4 - 32/4 = - 27/4
