Răspuns :
____ _____ ______ ___
a·b=(√3-√5)(√3+√5 )= √3² - √5² =√9-5 = √4 =2
_____ _____ _____ _____
(a-b)² =√(3-√5)²- 2(√3 -√5)(√3 + √5) + √(3 +√5)² =3-√5-2·2 +3+√5 = 6 - 4 =2
(a-b)² = a² - 2ab +b² aceasta formula am folosit-o
a·b=(√3-√5)(√3+√5 )= √3² - √5² =√9-5 = √4 =2
_____ _____ _____ _____
(a-b)² =√(3-√5)²- 2(√3 -√5)(√3 + √5) + √(3 +√5)² =3-√5-2·2 +3+√5 = 6 - 4 =2
(a-b)² = a² - 2ab +b² aceasta formula am folosit-o