解答

✨ 最佳解答 ✨

20a - 7b - 6c = 0 ...(1)
8a + 6b - 9c = 0 ...(2)

(1)×2:40a - 14b - 12c = 0 ...(3)
(2)×5:40a + 30b - 45c = 0 ...(4)
(4) - (3):44b - 33c = 0
44b = 33c => b : c = 3 : 4

(1)×3:60a - 21b - 18c = 0 ...(5)
(2)×2:16a + 12b - 18c = 0 ...(6)
(5) - (6):44a - 33b = 0
44a = 33b => a : b = 3 : 4

綜合以上可知:a : b : c = 9 : 12 : 16

[9, 12, 16] = 144 和題目差了 5 倍
=> [45, 60, 80] = 720
=> a = 45、b = 60、c = 80

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