Re: [計量] 我還有問題想要請教?
※ 引述《ogopogo (Enchanted..)》之銘言：
: ※ 引述《shenglan (拼了!GRE)》之銘言：
: １１＊１３＊１７＊１９＊２３
: : 5.a decrease of 1 in which of the factors bove would result in the greatest
: （ａｂｏｖｅ）
: : decrease in the product?
: : a)11 b)13 c)17 d)19 e)23
: ５個數 １１＊１３＊１７＊１９＊２３ 相乘
: 哪一個因子減１之後 會和原來差最多？
: （１１－１）＊１３＊１７＊１９＊２３ ＜
: １１＊１３＊１７＊１９＊（２３－１） ＜
: １１＊１３＊１７＊１９＊２３
: （ａ）
請教別題?
1.the daily rate for a hotel that sleeps 4 people is $39 for one person and X
dollars for each additional person.if 3 people take the room for only one day
and each pays $21 for the room,what is the value of X?
a)6 b)8 c)12 d)13 e)24
2.s is the sum of three consecutive integers,the greatest 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?
a)s-6 b)s-3 c)s+3 d)s+6 e)2s
3.an emergency vehicle travels 10 miles at a speed of of 50 miles per hour.
how fast must the vehicle travel on the return trip if the round trip
travel time is to be 20 mins?
a)55mph b)60mph c)65mph d)70mph e)75mph
Ans:距離=時間*速率
我是把去程的時間算出來了，需要12mins
然後我就搞不懂了><"
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