Choosen As Best Answer

1.從攤位面積算:
(36 -2x)*x*2*2 + (24 -4x)*x*2 = 432
-8x^2 +144x -8x^2 +48x = 432
-16x^2 +192x = 432
x^2 -12x +27 = 0
(x -3)(x -9) = 0
x = 3 or 9(不合,想想看為什麼?)

36/3 = 12, 12 - 2 = 10, 10*4 = 40
24/3 = 8, 8 - 4 = 4, 4*2 = 8
40 + 8 = 48 ... (B)

2.從空白面積算:
(36 -2x)(24 -4x) + 8x^2 = 36*24 - 432
16x^2 -192x +432 = 0
x^2 -12x +27 = 0
(x -3)(x -9) = 0
x = 3 or 9(不合)

訪客

謝謝你解釋的非常詳細

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