Odpowiedzi

2009-11-21T15:41:46+01:00
(√5-1)(√5+1)+(√5+1)²-(√5-1)²-(√5+8) = 5-1+5+2√5+1-5+2√5-1-√5-8= 3√5 - 4
2009-11-21T15:42:59+01:00
(√5 -1) (√5+1) +(√5 +1)² -(√5 -1)² -(√5 +8) =
= 5 -1 + (5 +2√5 +1) -(5 -2√5 +1) -(√5 +8) =
=2√5 +2√5 -√5 +4 - 8 = 3√5 -4
2009-11-21T15:52:41+01:00
(√5-1)(√5+1)+(√5+1)²-(√5-1)²-(√5+8)=
√5²+√5-√5-1²+√5²+1²-√5²-1²-√5+8=
=5-1-√5+8=12-√5=12-2,24=9,76