(2radical45-radical225)×(-3radical5)+2

Răspuns :

(2radical45-radical225)×(-3radical5)+2 =

(2×3√5-15)×(-3√5)+2 =

(6√5-15)×(-3√5)+2 =

-18√25 + 45√5 + 2 =

-18×5 + 45√5 + 2 =

-90 + 45√5 + 2 = -88 + 45√5