[計量] 幾題GWD

[qqopqqop (p )]

Q1 What is the greatest common factor of the positive integers j and k
1 k=j+1
2 jk is divisible by 5

ans A  怎麼會是A ><

Q2 From leland's gross pay of p dollars last week, t percent was deducted

for taxes and then s dollars was deducted for savings.  What amount of

leland's gross pay last week remained after these two deductions?

1p-s=244
2pt=7522

Ans C 這堤完全沒頭緒 唉

Q3 A certain list consists of 21 different numbers.  If n is in the list

and n is 4 times the average of the other 20 numbers in the list, then

n is what fraction of the sum of the 21 numbers in the list

Ans B 這題我也想很久可是算不出來

Q4 A company has assigned a distinct 3-digit code number to each of

its 330 employees Each code number was formed from the digits

2,3,4,5,6,7,8,9

and no digit appears more than once in any one code number.  How many

unassigned code numbers are there?

Ans 6 我算兩百多

唉 希望有高手可以幫我一下 我數學實在很差



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◆ From: 59.115.96.214
推 flac:Q1當中的(1)是否有給錯? Q3 n=4*sum(Xi)/20, sum(Xi)=5n
→ flac:所以21個數的總和=n+5n=6n 所以答案為1/6
→ qqopqqop:感激 1沒有錯喔 我又確認一次 滔滔10 p9
推 flac:k=j+k 這樣的話j不就等於0?
→ Engedi:Q4: (8*7*6)-330=6?
推 flac:great 樓上正解
→ qqopqqop:對不起 是j+1
※ 編輯: qqopqqop        來自: 59.115.96.214        (08/26 22:01)
推 flac:如果 k=j+1的話 j與k的最大公因數就是j啦 所以答案A沒錯
推 flac:Q2 剩餘的薪水為p(1-t/100)-s 要解出這式子必須(1)(2)合作- C
推 antonia:Q1最大公因數是1喔，用國小畫三條直線求最大公因數即可
→ antonia:所以用(1)就可以直接求
推 antonia:Q2 p-pt/100-s < 0 ？不合理？
推 flac:阿我講錯 是1沒錯 不好意思 打太快了 sorry