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Кискамурыска2
@Кискамурыска2
July 2022
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30 БАЛЛОВ!1! х+2х+х...+20х=2100
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ludkitaewa
A1 = x
an = 20x
n=20
Sn = n(a1 + an) / 2 = 2100
20(x + 20x) / 2 = 2100
21x = 210
x = 10
1 votes
Thanks 1
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Answers & Comments
an = 20x
n=20
Sn = n(a1 + an) / 2 = 2100
20(x + 20x) / 2 = 2100
21x = 210
x = 10