" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
a1=2
an=a10=8
Sn= ( a1+an) /2 *n
S10=(2+8) /2 *10
A
S10=(a1+a10)*10/2
wiec odpowiedz a)