Question

Determinati :
a) media aritmetica a numerelor 21;2√3;6-2√3
b) natura numarului x=|7-√50|-√50+2 in R ; in N
c) numarul mai mare dintre 5+2√3 si 5-2√3

Answer 1

a) media aritmetica a numerelor 21;2√3;6-2√3
(21+2√3+6-2√3)/3=(21+6)/3=27/3=9

b) natura numarului x=|7-√50|-√50+2 in R ; in N
7-√50<0
|7-√50|=-(7-√50)=-7+√50
x=|7-√50|-√50+2=-7+√50-√50+2=-5            {-5}∈R

 c) numarul mai mare dintre 5+2√3 si 5-2√3
5+2√3 >5-2√3