Ghotius
6 год назад
Решить: x
ОТВЕТЫ
Градовский
Aug 8, 2019
X^6 - 7x^3 - 8 = 0
x^3 = t ==gt;
t^2 - 7t - 8 = 0
D = 49 + 32 = 81 = 9^2
t1 = ( 7 + 9)/2 = 8
t2 = ( 7 - 9)/2 = - 1
x^3 = 8
x = 2
x^3 = - 1
x = - 1
Ответ
- 1 ; 2
x^3 = t ==gt;
t^2 - 7t - 8 = 0
D = 49 + 32 = 81 = 9^2
t1 = ( 7 + 9)/2 = 8
t2 = ( 7 - 9)/2 = - 1
x^3 = 8
x = 2
x^3 = - 1
x = - 1
Ответ
- 1 ; 2
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