Re: [計量] 想請教幾題計量?
※ 引述《applepenguin (皮)》之銘言：
: BB TEST10
: P.399
: 18:the daily rate for a hotel room that sleeps 4 epople is $39 for one
: person and x dollars for each additional person. If 3 people take the
: room for one day and each pays $21 for the room, what is the value of
: x?
: ANS:12
一間4人房一個人住一天39元，每多一個人要多付X元
如果三個人住一天每人要付21元，問X是多少
三個人住
所以房租是
39 + 2X = 3*21 = 63
2X = 24
X = 12
: TEST22 P860
: 27: City Y has installed 30 parking meters at 15-foot intervals along a
: straight street. what is the number of feet between the first meter
: and the last meter
: ANS:435
Y城市有30個parking meters在一條直路上，每個parking meters間隔15 foot寬
問第一個和最後一個隔多遠
問第1個和第30個隔間多遠
中間有29個區間
所以 29 * 15 = 435
: P.897
: 14: after 2 females leave a party. there are twice as many males as
: females as males
: ANS: the total number of people left at the party after the 9
: males leave > 8
感覺題目怪怪的 先跳過 XD
可以把題目完整的寫出來嗎？
感覺有漏資訊或是寫錯
: p.741
: 29:of the positive integers that are multiples of 30 and are less
: than or equal to 360, what fraction are multiples of 12?
: ANS:1/2
30的倍數且小於等於360的數中，有多少比例是12的倍數
不是：30 90 150 210 270 330
是：60 120 180 240 300 360
剛好一半
1/2
: P.760
: 28:S is the sum of three consecutive integers, the greaest of which is x. In
: terms of S, which of the following is the sum of three consecutive
: integers, the least of which is x?
: ANS:S+6
S是三個連續整數的合，最大是x
用S來表示的話，以下何者是三個連續整數的合，其中x是最小的數
S = x + (x-1) + (x-2) = 3x - 3
求 x + (x+1) + (x+2)
x + (x+1) + (x+2) = 3x + 3 = (3x - 3) +6 = S + 6
還有一題表格題
for any pair of successive years between 1977 and 1982, inclusive,
the increase or decrease in the number of ponds was between
0.7 and 2.8 million
包含1977~1982，每個相鄰的年份之間，ponds的增或是減介於0.7 and 2.8 million
主要是看(77,78)(78,79)(79,80)(80,81)(81,82)的ponds量的比較
例如(77,78)的ponds是2.5和3.75，所以是增加1.25
每個區間都比一次
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◆ From: 111.248.9.100
※ 編輯: rock1985 來自: 111.248.9.100 (06/09 01:58)
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