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MaksAisa39
@MaksAisa39
July 2022
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a1=429 d=-22 Sn=3069 n-?
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igir12370
Sn=0,5*(a1+an)*n;3069=0,5*(429+an)*n;6138=(429+an)*n;an=a1+d(n-1)=429-22n+22=451-22n;6138=(429+451-22n)*n;6138=880n-22n^2;n^2-40n+279=0;D=1600-1116=484;n1=(40-22):2=9;n2=(40+22):2=31;ответ:9; 31
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