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Alinanalina
@Alinanalina
August 2022
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найдите первый элемент и разность аорифметической прогрессии {а1+а10=12 {а8-а5=4
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AnonimusPro
Verified answer
По формуле n члена:
a10=a1+9d;
a8=a1+7d;
a5=a1+4d;
a1+a1+9d=12;
a1+7d-a1-4d=4;
3d=4;
d=4/3;
2a1+9d=12;
2a1+12=12;
2a1=0;
a1=0;
Ответ: d=4/3; a1=0
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Verified answer
По формуле n члена:a10=a1+9d;
a8=a1+7d;
a5=a1+4d;
a1+a1+9d=12;
a1+7d-a1-4d=4;
3d=4;
d=4/3;
2a1+9d=12;
2a1+12=12;
2a1=0;
a1=0;
Ответ: d=4/3; a1=0