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國二數學,請詳解,急急急
Jan 12th 2014, 13:20

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B在線AC上，線BC＝2，設AB = x，所以AC = x+2 線AB：線BC＝線BC：線AC == x : 2 = 2 : (x+2) == x^2 + 2x - 4 = 0 == x = -1 + √5 或 -1 - √5 (負值，捨去) 所以，線BC：線AB的比值是 2 / (-1 + √5) = (1 + √5) / 2...
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