Ответы на вопрос:
Log 0,0625(5х-7/7) = -0,5 log 0,25²(5х-7/7) = -0,51/2 log 0,25(5х-7/7) = -0,5 log 0,25(5х-7/7) = -1 log 0,5 ²(5х-7/7) = -1 1/2 log0,5(5х-7/7) = -1 log 0,5 (5х-7/7) = -2 log 1/2 (5х-7/7) = - 2 log2^-1 (5х-7/7) = - 2 - log 2 (5х-7/7) = - 2 log 2 (5х-7/7) = 2 log 2 (5х-7/7) = log 2 (4) 5х-7/7 = 4 5х-7 = 28 5х = 35 x = 7 ответ: 7
Решение (х^2+2х)(х^2+2х-2)=3x² + 2x = t t*(t - 2) = 3 t² - 2t - 3 = 0 t₁ = - 1 t₂ = 3 1) x² + 2x = - 1 x² + 2x + 1 = 0 (x + 1)² = 0 x₁ = x₂ = - 1 2) x² + 2x = 3 x² + 2x - 3 = 0 x₃ = - 3 x₄ = 1 ответ: x₁ = x₂ = - 1; x₃ = - 3; x₄ = 1
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