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Zhenya2001a
@Zhenya2001a
March 2022
1
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Алгебра 9 класс.Даю 13 баллов
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LyubaAlexandorovna
1) а3=а1+2*d a9=a1+8*d a1+a9=2*a1+10*d=2*(a1+5*d)=8 a1+5*d=4
S11=(2*a1+d*10)*11/2=11*a1+55*d=11*(a1+5*d)=11*4=44
2) Сумма арифметической прогрессии
S15=(2*a1+d*(n-1))*n/2=(2*a1+2*14)*15/2=15*a1+210=240 15*a1=30 a1=2
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Thanks 1
Zhenya2001a
большое спасибо
Zhenya2001a
премного благодарен
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Answers & Comments
S11=(2*a1+d*10)*11/2=11*a1+55*d=11*(a1+5*d)=11*4=44
2) Сумма арифметической прогрессии
S15=(2*a1+d*(n-1))*n/2=(2*a1+2*14)*15/2=15*a1+210=240 15*a1=30 a1=2