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elya97elya97
@elya97elya97
August 2022
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решите уравнение 5^x-1+5^x-2+5^x-3=155 рееешиите пожлуйстааа, только без логарифмов пожалуйстаа
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mathformula
5^(x-1) +5^(x-2) + 5^(x-3) =155
1/5 * 5^x + 1/25 * 5^x + 1/125 * 5^x = 155
0.2 * 5^x + 0.04 * 5^x + 0.008 * 5^x = 155
5^x = t
0.2t +0.04 t +0.008t =155
0.248t =155
t= 155/0.248
t=625
5^x = 625
5^x = 5^4
x=4
2 votes
Thanks 6
zhenyaM2002
Verified answer
Тут логарифмы не нужны.
2 votes
Thanks 4
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Answers & Comments
1/5 * 5^x + 1/25 * 5^x + 1/125 * 5^x = 155
0.2 * 5^x + 0.04 * 5^x + 0.008 * 5^x = 155
5^x = t
0.2t +0.04 t +0.008t =155
0.248t =155
t= 155/0.248
t=625
5^x = 625
5^x = 5^4
x=4
Verified answer
Тут логарифмы не нужны.