Предмет: Алгебра, автор: stAlkur4

Арифметическая прогрессия . 1)a1=4,a2=6, d-? 2)6;2;....a3-? 3)a1=1;d=4, a10-? 4)a1=6,a5=46, S5-? 5)a1=0.2,d=-0.3 S5-? 6)a1=-4;d=3.Найдите a20.(.7)a7=21;a9=29.Найдите d,a1.8)a1=-3;d=7.Найдите S7

Ответы

Автор ответа: ЮлИя0809

1) d = a2-a1= 6-4=2
2)a3=a1 + d (n-1) = 6 + (-4)(3-1) = -2
3) a10= 1 + 4 (10-1) = 37

Автор ответа: ЮлИя0809

Я уже точно не помню как сумму находить

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