Re: [計量] 在官網上找到的題目?
: 2.The cost, in dollars, of manufacturing x refrigerators is 9,000 + 400x.
: The amount received when selling these x refrigerators is 500x dollars.
: What is the least number of refrigerators that must be manufactured and
: sold so that the amount received is at least equal to the
: manufacturing cost?
: a)10 b)18 c)45 d)90 e)100
: answer is d
: 這題是我是這樣寫9000+4x=500X
: 然後我把選用代入
: 如果符合就是正解(這是正確做法嗎?)
你是想要寫 9000+4"00"x = 500x吧....
這樣解OK阿~
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 125.232.140.2
→
05/16 02:56, , 1F
05/16 02:56, 1F
討論串 (同標題文章)
本文引述了以下文章的的內容：
完整討論串 (本文為第 3 之 3 篇)：
GRE 近期熱門文章
PTT職涯區 即時熱門文章
131
357