3. Oblicz:
f) (2√5-√10)²-(2√5+1)(1-2√5)=
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= 4 * 5 - 4√50 + 10 - (1 - 4 * 5) = 20 - 4√50 + 10 - (1 - 20) = 30 - 4√50 - 1 + 20 =
= 49 - 4√50 = 49 - 4√2 * 25 = 49 - 20√2