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voynov1997
@voynov1997
July 2022
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2*9^x+45*3^x-243 больше либо равно нулю
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ДжонниКэтсвил
3^x= t
2*t ^2 + 45 * t - 243 больше либо равно нулю ( б.л.р.н.)
2t^2 + 45t - 243 б.л.р.н.
D= 2025 - 4*2*(-243)= 3969 = 63
Х1= (- 45 +63)/4 = 9/2
X2= (-46 - 63)/4 = - 27
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voynov1997
спасибо
ДжонниКэтсвил
пожалуйста
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Answers & Comments
2*t ^2 + 45 * t - 243 больше либо равно нулю ( б.л.р.н.)
2t^2 + 45t - 243 б.л.р.н.
D= 2025 - 4*2*(-243)= 3969 = 63
Х1= (- 45 +63)/4 = 9/2
X2= (-46 - 63)/4 = - 27