求解2條中四數學題~~～
2012-04-06 2:43 am
回答 (1)
2012-04-06 5:16 am
✔ 最佳答案
10)設 x = aˡᵒᵍ ⁽ˡᵒᵍ ᵃ⁾ˡ ˡᵒᵍ ᵃ log x = log aˡᵒᵍ ⁽ˡᵒᵍ ᵃ⁾ˡ ˡᵒᵍ ᵃ log x = [log (log a) / log a] log a log x = log (log a) x = log aaˡᵒᵍ ⁽ˡᵒᵍ ᵃ⁾ˡ ˡᵒᵍ ᵃ = log a12)a , b 為 x² + 3x + k = 0 之兩根。a² + b² = 11(a + b)² - 2ab = 11(- 3)² - 2(k) = 11k = - 1選 A。
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