Question

va rog ajutatima
a)a=0,45;b=1/5
b)a=4/7;b=25/7

Answer 1

Media aritmetica e suma celor doua numere impartita la cate nr sunt.
Media geometrica e radical din produsul numerelor.
a) a=0,45, b=1/5
a=45/100, simplificam prin 5 ca sa aducem intr-o forma cat mai simpla.
a=9/20
media aritmetica (e notata cu m indice a) m=(9/20+1/5)/2
Aducem la acelafi numitor m=(9/20+4/20)/2
m= (13/20)/2, deci m= 13/40
media geometrica (notata m indice g) m=√9/20*1/5
m= √9/100, adica m=√9/√100, deci m= 3/10

b)a=4/7, b=25/7
media aritmetica: m=(4/7+25/7)/2 
m=(29/7)/2
m= 29/14
media geometrica: m= √4/7*25/7
m=√100/49
m=√100/√49
m=10/7