U3=3
U8=23
a+2b=3
a+7b=23 dieleminisai
5b=20
b=4
a+2(4)=3
a=3-8
a=-5
sn=n/2(2a+(n-1)b)
s20=10(-10+(19)4)
s20=10(66)
s20=660
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U3=3
U8=23
a+2b=3
a+7b=23 dieleminisai
5b=20
b=4
a+2b=3
a+2(4)=3
a=3-8
a=-5
sn=n/2(2a+(n-1)b)
s20=10(-10+(19)4)
s20=10(66)
s20=660