Question

Fie numerele : a= √7+5, b = 5- √7 . Calculati media geometrica si media aritmetica a numerelor a si b 

Answer 1

Ma=(a+b)/2 => Ma=$( \sqrt{7} + 5 +5 - \sqrt{7})/2=10/2=5$
$Mg= \sqrt{a*b} = \sqrt{(5- \sqrt{7})(5+ \sqrt{7} ) } = \sqrt{25-7} = \sqrt{18} =3 \sqrt{2}$