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deAD20041999
@deAD20041999
August 2022
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ПОМОГИТЕ
{an} - арифметическая прогрессия, а8=4; а13=7,5. Найти: d
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mikael2
Verified answer
По формуле общего члена аn=a1+(n-1)d a8= a1+7d=4
a1+12d=7.5 a1+7d+5d=7.5 4+5d=7.5 5d=7.5-4=3.5
d=3.5/5=0.7
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Verified answer
По формуле общего члена аn=a1+(n-1)d a8= a1+7d=4a1+12d=7.5 a1+7d+5d=7.5 4+5d=7.5 5d=7.5-4=3.5 d=3.5/5=0.7