Question

media aritmetica a numerelor a=$\sqrt{125}$ - 3$\sqrt{20}$ si b= 3$\sqrt{5}$ + $\sqrt{80}$

Answer 1

rad125=5rad5
rad20=2rad5
=>a=(-rad5)
rad80=4rad5
=>b=7rad5
M.a.=(-rad5+7rad5)/2=3rad5

Answer 2

a = √125 - 3√20

a = √5³ - 3√2²×√5

a = 5√5 - 3 × 2√5

a = 5√5 - 6√5

a = - √5

_________

b = 3√5 + √80 = 3√5 + 4√5 = 7√5

_______________

Ma = ( - √5 + 7√5 ) / 2 = 6√5 / 2 = 3√5 → media aritmetica