[求助]GWD13套中第五套的数学疑问 求助ing

crystalhou

Q15 which of the following fractions has a decimal equivalent that is a terminating decimal?

A.10/189

b.15/196

C.16/225

D.25/144

E.39/128

通常这样的题目应该怎么算?如果s算的话要花很多时间呢~

Q22 The # of defects in the first five cars to come through a new production line are 9,7,10,4, and 6, respectively. if the 6th car through the production line has either3,7,or 12 defects, for which of these values does the mean number of defects per car for the first six cars equal the median?

a. 3

b.7

c.12

A. a only

B. b only

C, c only

D. a and c only

E. a, b,and c

我怎么算都是选择B啊。求median的话不是刚好是7嘛？

Q24, On a map town G is 10 centimeters due east to Town H and 8 centimeters due south of Town J. which of the following is closet to the straight-line in centimeters, between Town H and Town J on the map?

A.6

B.13

C.28

D.20

E.24

我知道大概是用就是用勾股定理吧，但是不明白 due east to Town H and due south to Town J 的意思，所以根本做不出来哦。我求的答案是6。。。求助ing

Q28  英文比较长，我打中文吧。 今年哈里会存一定的收入，同时会花费一些。下一年，哈里会没有收入。但是他今年存的 each dollar 会让他在下一年用1+r dollars 去花。 用r来表示，什么样的fraction of his income should herry save this year so that next year the amount he was avaialbe to spend will be equal to half the amount that he spend this year?

answer is 1/2r+3

我的数学不好，NN们说中国人，数学应该拿50+，但是我这次做GWD 错了15个，今天做GWD的第四套错了8个。是在进步了。但是还是要加油。GWD 第四套的数学也有不懂的，会在另外一个帖子询问。麻烦大家帮帮忙了。我准备5月11日广州一战，1号做了一套pre，成绩非常非常的不好。不过我会努力的，调整心态，做到正常发挥。。

yulinling

Q15看那个数的分母是2或5的n次方.

Q22.X=3时, mean=mediam=6.5; X=12时, mean=mediam=8. 只有B不对.再算算.

Q24.是用勾股定理.due east to Town H and due south to Town J 就是两个直角边横向,纵向一个为8,一个为10,求斜边,为164开平方,最接近13.

Q28 设所求faction 为X

X(1+r)=1/2(1-X)

X(3/2+r)=1/2

X= 1/2r+3

   

crystalhou

谢谢哦..