Oblicz:
(√5+1)²-2(√5-2)²=
(√5+1)²-2(√5-2)²=5+2√5+1-2(5-4√5+4)=6+2√5-10+8√5-8=-4-8+10√5=-12+10√5
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(√5+1)²-2(√5-2)²=5+2√5+1-2(5-4√5+4)=6+2√5-10+8√5-8=-4-8+10√5=-12+10√5