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a)
3√27 + 5√48 = 3√(9 * 3) + 5√(16 * 3) = 9√3 + 20√3 = 29√3
b)
√125 - 2√80 = √(25 * 5) - 2√(16 * 5) = 5√5 - 8√5 = - 3√5
c)
(2√2 - 5) - (7 - 3√3) = 2√2 - 5 - 7 + 3√3 = 2√2 + 3√3 - 12 = 2√2 + 3(√3 - 4)
d)
(2√2 - 5)(3√2 - 1) = 6 * 2 - 15√2 - 2√2 + 5 = 12 - 17√2 + 5 = 17 - 17√2 =
= 17(1 - √2)
zad 2
a)
2/3√5 = 2 * √5/3√5 * √5 = 2√5/3 * 5 = 2√5/15
b)
7/4√2 = 7 * √2/4√2 * √2 = 7√2/4 * 2 = 7√2/8