看板
[ GMAT ]
討論串[計量] PP-T1-DS-214
共 5 篇文章
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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 slabthat i
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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??. 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. =
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