Re: [計量] 四題數學
※ 引述《sabinayang (Sabina)》之銘言：
: Big Book裡P.619
: 9. On a 50-question multiple-choice test, 3 points were given for each question
: answered correctly and 1 point was deducted for each question answered
: incorrectly. A student who answered all of the questions on the test received
: a total of 98 points.
: A: The number of questions on the test that the student answered incorrectly.
: B: 14
: Ans: B
: 我一開始選D
: 想法是: 總分150-得分98=52 52/3=14
: A column 是寫"答錯的題數" 要是在這多選題裡可以一題錯一個選項而被扣一分
: 則可能造成錯的題數比14題多所以我選D
題目應該是說只要答錯一題就倒扣一分 不管錯幾個選項
原式52/3 應該改成52/4 = 13 就是答錯的題目數
: 28. 4-n [] 6 4-n [] 5
: Which of the following symbols ahould be substituted for [] to make both of the
: statment s above true for all integers n such that -2 < n <= 3?
: (A)<= (B)< (C)= (D)> (E)>=
: Ans:A
: 要是=不可以選那A和E不就都不可以選了?
題意應該是說符號代入必定成立
<=的意思是說<"或"= 也就是<=涵蓋的範圍叫=來的大
所以應該選<=
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