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Exercitiul 20 efectuati:punctele a,b

Exercitiul 20 Efectuatipunctele Ab class=

Răspuns :

Iakabcristina2
a)(6√5+3+10√3-5)/15 : (1/3 - 1/5 - 2√3/3 - 2√5/5)=
(6√5+10√3-2)/15 x 15/(5-3-10√3-6√5)=
(6√5+10√3-2)/-(6√5+10√3-2)=
-1

b)5(5√6-2√3)/(150-12) · (√3/15 + √6/2 - √6/3) = 
5(5√6-2√3)/138 · (2√3+15√6-10√6)/30 =
5(5√6-2√3)(5√6+2√3)/(138·30)=
138/(138·6)=
1/6

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