" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
4r = 32-12=20
r=5
a₅ = a₃+2r
a₅=12+2*5=12+10=22
II sposob:
a₅ = 1/2*(a₃+a₇)
a₅=1/2*(12+32)=1/2*44
a₅=22
a3=a1+2r
a7=a1+6r
a7-a3=6r-2r
4r=32-12
r=20:4
r=5
a1=a3-2r
a1=12-2*5
a1=2
a5=2+4*5
a5=22