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Aidos13
@Aidos13
July 2022
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Дана прогрессия: 3; 2,9; 2,8; 2,7.... Найдите номер первого отрицательного члена этой прогрессии.
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Sougura
A1=3,d=-0,1
a1+d*(n-1)<0
3-0,1(n-1)<0
3-0,1n+0,1<0
-0,1n<-3,1
0,1n>3,1
n>31.Думаю так.
n=32.
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Thanks 0
karinaK99
А1= 3
d= -0.1
an= a1+d(n-1) <0
3-0.1(n-1)<0
n>31 n=32
1 votes
Thanks 0
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Answers & Comments
a1+d*(n-1)<0
3-0,1(n-1)<0
3-0,1n+0,1<0
-0,1n<-3,1
0,1n>3,1
n>31.Думаю так.
n=32.
d= -0.1
an= a1+d(n-1) <0
3-0.1(n-1)<0
n>31 n=32