Choosen As Best Answer

假設內框的寬度 = a,則外框的寬度 = 3a
(74 - 3a - 3a - a - a)(56 - 3a - 3a - a) = 406*6 = 2436
(74 - 8a)(56 - 7a) = 2436
56a^2 - 966a + 1708 = 0
8a^2 - 138a +244 = 0
4a^2 -69a +122 = 0
(a -2)(4a -61) = 0
a = 2 or 61/4(不合)

外框的寬度 = 3a = 6

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