log²₃x - 5log₉x + 1,5 = 0;
log²₃x - 2,5log₃x + 1,5 = 0;
Замена: log₃x = t.
t² - 2,5t + 1,5 = 0;
t₁= 1,5; t₂ = 1.
log₃x = 1,5; log₃x = 1
x₁ = 3√3 x₂ = 3
Ответ: 3√3; 3.
16log²₁₆x + 3log₄x - 1 = 0;
4log²₄x + 3log₄x - 1 = 0;
Замена: log₄x = t/4
t² + 3t - 4 = 0;
t₁ = -4; t₂ = 1;
log₄x = -4/4 = -1; log₄x = 1/4
x₁ = 4⁻¹=1/4 x₂ = ⁴√4
Ответ: 1/4; ⁴√4.
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Answers & Comments
log²₃x - 5log₉x + 1,5 = 0;
log²₃x - 2,5log₃x + 1,5 = 0;
Замена: log₃x = t.
t² - 2,5t + 1,5 = 0;
t₁= 1,5; t₂ = 1.
log₃x = 1,5; log₃x = 1
x₁ = 3√3 x₂ = 3
Ответ: 3√3; 3.
16log²₁₆x + 3log₄x - 1 = 0;
4log²₄x + 3log₄x - 1 = 0;
Замена: log₄x = t/4
t² + 3t - 4 = 0;
t₁ = -4; t₂ = 1;
log₄x = -4/4 = -1; log₄x = 1/4
x₁ = 4⁻¹=1/4 x₂ = ⁴√4
Ответ: 1/4; ⁴√4.