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borisovaekater2
@borisovaekater2
August 2022
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Помогите пожалуйста: (а)-ор.пр
а11=92
S11=22
найти: a1 - ? d - ?
Решение:
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prettylokhina
S11= (a1+a11)*n /2
n=11
a1+a11=S11*2/n
a1+a11=22*2/11
a1+a11=4
a1+92=4
a1=4-92
a1=-88
a1+10d=a11
-88+10d=92
10d=92+88
10d=180
d=18
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Answers & Comments
n=11
a1+a11=S11*2/n
a1+a11=22*2/11
a1+a11=4
a1+92=4
a1=4-92
a1=-88
a1+10d=a11
-88+10d=92
10d=92+88
10d=180
d=18