[計量] 請板友們幫幫我吧?我有數學題不會算!?
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
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
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
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
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
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
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
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
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
**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!!!
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