Sześcian sumy liczb pierwiastek z 5 i 1
(√5+√1)³=(√5+√1)(√5+√1)(√5+√1)=(√5+√1)(5+√5+√5+1)=(√5+√1)(6+2√5)=6√5+2*5+6*1+2√5*1=6√5+10+6+2√5=8√5+16=8(√5+2)
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(√5+√1)³=(√5+√1)(√5+√1)(√5+√1)=(√5+√1)(5+√5+√5+1)=(√5+√1)(6+2√5)=6√5+2*5+6*1+2√5*1=6√5+10+6+2√5=8√5+16=8(√5+2)