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1agbdlcid
@1agbdlcid
August 2022
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Даю 25 баллов!!!! Буду благодарен)))
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Давнонеученица
А1=-8 d= 2. а20 = -8+ 2*19= 30. S20= (-8+30)*20/2= 440:2= 220
2 votes
Thanks 1
Яна38516
Sn=(А1+(n-1)*d/2)*n
a1=-8
d=2
S20=-8+(20-1)*2/2 *20=
=-8+19*2/2 *20=
=-8+38/2 *20=
=30/2 *20=
=15*20=300
1 votes
Thanks 0
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Answers & Comments
a1=-8
d=2
S20=-8+(20-1)*2/2 *20=
=-8+19*2/2 *20=
=-8+38/2 *20=
=30/2 *20=
=15*20=300