[(1+√5)²-(1-√5)²]² jest równa :
a) 0 , b) 80 c) 100 d)20
oblicz;d
[(1+√5)²-(1-√5)²]²=
=[(1+√5)(1+√5)-(1-√5)(1-√5]²=
=[1+√5+√5+5-(1-√5-√5+5)]²=
=[1+2√5+5-1+√5+√5-5]²=
=(4√5)²=16*5=80
odpowiedź: b
" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
[(1+√5)²-(1-√5)²]²=
=[(1+√5)(1+√5)-(1-√5)(1-√5]²=
=[1+√5+√5+5-(1-√5-√5+5)]²=
=[1+2√5+5-1+√5+√5-5]²=
=(4√5)²=16*5=80
odpowiedź: b