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stAlkur4
@stAlkur4
July 2022
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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
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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
8 votes
Thanks 15
stAlkur4
А 4)5)6)7
ЮлИя0809
Я уже точно не помню как сумму находить
stAlkur4
ладно, СПС
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Answers & Comments
2)a3=a1 + d (n-1) = 6 + (-4)(3-1) = -2
3) a10= 1 + 4 (10-1) = 37