Mg(a,b) = rad (a x b)
In cazul nostru:
a x b = (rad 5 - 1)(1 + rad 10)(rad 10-1)(1 + rad 5) = (rad5 - 1)(rad 5 +1)(rad 10+1)(rad 10 - 1) = [(rad5)^2 - 1^2] x [(rad 10)^2 - 1^2] = (5-1)(10-1) = 4 X 9 = 36
Mai intai am reasezat termenii in mod convenabil, apoi am aplicat formula:
(a-b)(a+b) = a^2 - b^2
Media geometrica = rad (axb) = rad 36 = 6
