Дано: a₁=15
a(n)=85
d=2
a(n)=a₁+2(n-1)
85=15+2(n-1)
n=36;
S₃₆=((15+85)*36)/2=1800.
Ответ: 1800.
Copyright © 2024 SCHOLAR.TIPS - All rights reserved.
Answers & Comments
Verified answer
Дано: a₁=15
a(n)=85
d=2
a(n)=a₁+2(n-1)
85=15+2(n-1)
n=36;
S₃₆=((15+85)*36)/2=1800.
Ответ: 1800.