解答

✨ 最佳解答 ✨

假設如圖
3x = 5y
=> y = 3x/5
(3x+2) + (x+2y+2) = 56
=> 4x + 2y = 52
4x + 2(3x/5) = 26x/5 = 52
x = 52*5/26 = 10
y = 3x/5 = 6
所求 = 10*6*0.5 = 30

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