Re: [計量] BB Test7 Sec.4 No.9,28
※ 引述《iambaca ()》之銘言:
: 請問一下兩題題目意思
: no.9
: n=7*19^3
: column A:The number of distinct positive factors of n
: column B:10
: Ans:B
column A: n的因數之個數 = (1+1)*(3+1)=2*4=8
用排列組合的方式算出有幾個因數;+1是因為可以不選
: no.28
: By weight, liquid A makes up 7.0 percent of solution I and
: 14.5percent of solution II. If 3 grams of solution I is mixed with
: 2 grams of solution II, then A accounts for what percent of the weight
: of the resulting solution?
: (A)6.09% (B)10% (C)10.75% (D)21.5% (E)50%
: Ans:B
: 謝謝解答~
重量含量百分比
I:7%的liquid A
II:14.5%的liquid A
所求=(resulting solution 中含liquid A 的重量)/(resulting solution的總重)
=(7%*3+14.5%*2)/(3+2)=50%/5=10%
大概是這樣吧^^
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※ 編輯: nehsband 來自: 140.112.243.79 (10/13 08:48)
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