※ 引述《rnrn ()》之銘言： : The cost of a square slab is proportional to its thickness and also : proportional to the square of its length. What is the cost of a square slab : that is 3 meters long and 0.1 meter thick? 木板成本跟厚度成正比 跟邊長平方成正比 請問 3公尺長 0.1公尺厚的木板成本多少?? : (1) The cost of a square slab that is 2 meters long and 0.2 meter thick is : $160 more than the cost of a square slab that is 2 meters long and 0.1 meter : thick. 2公尺長 0.2公尺厚 => x 元 2公尺長 0.1公尺厚 => y 元 x:y = 0.2:0.1 (跟厚度成正比) => x = 2y 又 x-160 = y => 2y-160 = y => y=160 所以說 2公尺長 0.1公尺厚 => 160元 3公尺長 0.1公尺厚 => x 元 160:x = 2平方:3平方 (跟長度成平方比) x = 360 元 : (2) The cost of a square slab that is 3 meters long and 0.1 meter thick is : $200 more than the cost of a square slab that is 2 meters long and 0.1 meter : thick. 跟1是一樣的道理 : 嗯! 其實我是看不太懂題目的意思 : 請大家幫我解答 謝謝^^ 不知道對不對Q 不過這題很明顯在說長度跟厚度改變時 價格如何變動 要是你有勇氣的話 基本上就有一種fu可以猜猜看D --

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