bonjour
a = 2√5 - 3 et b = 2 √5 + 3
A + B = 2 √5 - 3 + 2 √5 + 3 = 4 √5
A - B = 2 √5 - 3 - ( 2 √5 + 3 ) = 2 √5 - 3 - 2 √5 - 3 = - 6
A² + B² = ( 2 √5 - 3 )² + ( 2 √5 + 3 ) ²
= 20 - 12 √5 + 9 + 20 + 12 √5 + 9
= 58
AB = ( 2 √5 - 3 ) ( 2 √5 + 3) = 20 - 9 = 11 (identité remarquable )
(A + B)² = [( 2 √5 - 3) +( 2 √5 + 3 )] ² = identité remarquable
= [ 2 √5 - 3 + 2 √5 + 3 ]²
= ( 4 √5) ² ( - 3 + 3 s'annulent )
= 16 * 5 = 80
Copyright © 2024 ELIBRARY.TIPS - All rights reserved.
Lista de comentários
bonjour
a = 2√5 - 3 et b = 2 √5 + 3
A + B = 2 √5 - 3 + 2 √5 + 3 = 4 √5
A - B = 2 √5 - 3 - ( 2 √5 + 3 ) = 2 √5 - 3 - 2 √5 - 3 = - 6
A² + B² = ( 2 √5 - 3 )² + ( 2 √5 + 3 ) ²
= 20 - 12 √5 + 9 + 20 + 12 √5 + 9
= 58
AB = ( 2 √5 - 3 ) ( 2 √5 + 3) = 20 - 9 = 11 (identité remarquable )
(A + B)² = [( 2 √5 - 3) +( 2 √5 + 3 )] ² = identité remarquable
= [ 2 √5 - 3 + 2 √5 + 3 ]²
= ( 4 √5) ² ( - 3 + 3 s'annulent )
= 16 * 5 = 80