Question

Calculați media aritmetica:
a=√50 - √18 + √125 - 2√5 - 2√2
b=( √5-1/√5 + 4√5) •5

Answer 1

a = 5√2-3√2+5-2√5-2√2 = 2√2-2√2+5-2√5 = 5-2√5
b = 5√5-5/√5+20√5 = 5√5+20√5-5/√5 (amplificam 5/√5 cu √5)
b = 25√5-5√5/5 (amplificam 25√5 cu 5)
b = 125√5/5-5√5/5 = 120√5/5 = 24√5
ma = (5-2√5+24√5)/2 = (5+22√5)/2