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Lina016
@Lina016
April 2021
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Очень срочно нужно
Дана арифметическая прогрессия (аn) : -1,4; 0,5 ; 2,4 ... Найдите а21
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gorgonaz
D=0,5-(-1,4)=1,9 a21=-1,4+1,9×20= -1,4+38=36,6
0 votes
Thanks 1
130520000
An= a1+d(n-1)
d= 0.5-(-1,4)= 1,9
a21=-1,4+1,9x20
a21=-1,4+38
a21=36,6
2 votes
Thanks 1
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Answers & Comments
d= 0.5-(-1,4)= 1,9
a21=-1,4+1,9x20
a21=-1,4+38
a21=36,6