解答

✨ 最佳解答 ✨

(7/13 x +1)^2 = 680 兩邊開根號
經查表 √680 = 26.077
7/13 x +1 = ±26.077
7/13 x = -1±26.077 (x 直接代 a, b 更快)
x = 13/7 * (-1±26.077)
a > b
a = 13/7 * (-1 + 26.077)
b = 13/7 * (-1 - 26.077)
a - b = 13/7 * [(-1 + 26.077) - (-1 - 26.077)]

7/13 a - 7/13 b
= 7/13 * (a - b)
= 7/13 * 13/7 * [(-1 + 26.077) - (-1 - 26.077)]
= (-1 + 26.077) - (-1 - 26.077)
= 26.077 + 26.077 = 52.154

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