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dee_ta

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  • leung_po_chuen
    2020-09-05 22:13:35

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  • dee_ta
    2020-09-06 11:23:48
    why equal to 1 not 2?
    •  leung_po_chuen 2020-09-05 22:13:35
    • 點擊查看回覆
  • leung_po_chuen
    2020-09-06 11:35:12
    兩面都LOG 但 LOG 的 BASE 是2 而不是10, 所以把2 變成1
    •  dee_ta 2020-09-06 11:23:48
    • why equal to 1 not 2?
  • 解數雜貨店
    2020-09-06 13:00:35
    Apply anti-log to both side, 3x²-x-1 = (2x-1)² 3x²-x-1 = 4x²-4x+1 x²-3x-2 = 0 x = 1 or 2
  • dee_ta
    2020-09-06 13:02:20
    what is this property ?
    •  解數雜貨店 2020-09-06 13:00:35
    • Apply anti-log to both side, 3x²-x-1 = (2x-1)² 3x²-x-1 = 4x²-4x+1 x²-3x-2 = 0 x = 1 or 2
  • dee_ta
    2020-09-06 13:03:36
    square?
  • 解數雜貨店
    2020-09-06 13:48:58
    Just the definition of log, logₐ y = x y = aˣ
  • dee_ta
    2020-09-07 00:13:29
    what is x
    •  解數雜貨店 2020-09-06 13:48:58
    • Just the definition of log, logₐ y = x y = aˣ
  • 解數雜貨店
    2020-09-07 09:09:44
    x is a real number. For instant, log₃9= 2 9 = 3²
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