Re: [計量] 請板友們幫幫我吧?我有數學題不會算!?

看板GRE (GRE入學考試)作者CCWck (幹嘛要暱稱)時間16年前 (2010/05/10 11:44)推噓2(2推 0噓 0→)

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※ 引述《shenglan (拼了!GRE)》之銘言： : 我今天剛把整本算完 : 有很多題都搞不太懂意思 : 請大家幫幫我吧?^^ : 1.which of the following CANNOT be expressed as the sum of the squares : of two integers? : a)13 b)17 c)21 d)29 e)34 哪個數字不能表示為兩整數平方和 2^2+3^2=13 1^2+4^2=17 2^2+5^2=29 3^2+5^2=34 : 2.if the value of the expression below is to be halved by doubling exactly : one of the five numbers a,b,c,d,or e,which should be doubled? : a)a b)b c)c d)d e)e : expression---> a+b/c : _______ : d/e 將其中一個數字兩倍的話這組運算式的值會變一半問你是哪一個答案d : 3.the rectanglular rug covers half of a rectangular floor that is 9 feet wide : and 12 feet long.if the dimensions of the rug are in the same ratio as those : of the floor,how many feet long is the rug? : a)6 b)21/2 c)2根號7 d)6根號2 e)4根號6 : 4.if $4,500 was invested in a bond fund when the price per share was $9 and : $3,000 was invested in the fund when the price per share was $10,what was : the average(arithmetic mean)price per share purchased? : a)$9.625 b)$9.50 c)$9.40 d)$9.375 e)$9,20 (4500+3000)/(4500/9 +3000/10)=9.375 : 5.how many of the positive integers less than 25 are 2 less an integer : multiple of 4? : a)two b)three c)four) d)five e)six 有幾個筆25小的正整數會比4的倍數少2 2 6 10 14 18 22 : 6.one month Mary used 1/6 of her monthly salary for a car payment and 1/4 more : than the car payment for rent.what fraction of her monthly salary did Mary : use that month for the car payment and rent combined? : a)5/24 b)3/8 c)5/12 d)1/2 e)7/12 1/6+(1/6*(1+1/4)) = 3/8 : 7.a secretary typed 6 letters,each of which had either 1 or 2 pages.if the : the secretary typed 10 pages in all,how many of the letters had 2 pages? : a)1 b)2 c)3 d)4 e)5 打兩頁的為a 打一頁的為b a+b=6 2a+b=10 a=4 b=2 : 8.a train travels 60 miles per hour for 3 hours and then 45 mile per hour : for 2 hours.what is the train's average speed in mile per hour during the : 5-hour period?(我最討厭速率題了，我每次都搞不懂觀念，所以遇到類似題都不會><") : a)55 b)54 c)52.5 d)51 e)50 速率=距離/時間 60*3+45*2 /5 =54 : 9.if 4x is 9 greater than the sum of x and 3y,then x is how much greater than y? : a)3 b)6 c)9 d)12 e)15 x+3y+9=4x 3y+9=3x x=y+3 : 10.a certain form letter is to be sent prospective customers.if 4 model-x : computers working independently can do a combined total of 4 of the letters : in 4 minutesmthen 100 model-x computers working independly can do a combined : total of 100 of the letters in exactly how many minutes?(為什麼還是4分鐘?) : a)4mins b)10mins c)25mins d)40mins e)100mins 4台電腦印四封信要4分鐘問100台電腦印100封信要多久想成每台電腦都只印一封信都要四分鐘就好啦 : **拜託!請大家幫幫我了><" : 我後面還有好多題要問 : 這個月25號就要考了 : 我很緊張阿!!! -- -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 140.109.134.47 ※ 編輯: CCWck 來自: 140.109.134.47 (05/10 15:33)