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√13²=13
3²=9
13-9=4
4x2=8
odp: a
zad.2
(2+√5)²=4+5=9
9x2=18
odp:b
zad.3
(√7+2√2) x (√7+2√2)
7+2√14+2√14+8
15+4√14x -2
-30-8√14
odp:a