in base 10 notation 是什么意思啊？

徐小鱼

If 10⁵⁰ – 74 is written as an integer in base 10 notation, what is the sum of the digits in that integer?

xrbear57

10进制吧？

徐小鱼

A photographerwill arrange 6 people of 6 different heights for photograph by placing them in two rows of three so that each person in the first row is standing in front of someone in the second row.The heights of the people within each row must increase from left to right, and each person in the second row must be taller than the person standing in front of him or her.How many such arrangements of the 6 people are possible?


A.5
B.6
C.9
D.24
E.     36                    Answer: D
能再帮我看看这道题吗？谢谢

ejason

第二道题怎么会选D? 选A啊

Rebeldom

第二题我看也是5种

徐小鱼

我看错答案了，是五种，能给我解释下吗？

徐小鱼

Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y.At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?


A.4
B.6
C.8
D.10
E.12
Q35:
What is the median number of employees assigned per project for the projects at Company Z?
(1)25 percent of the projects at Company Z have 4 or more employees assigned to each project.
(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
Answer: C

我哭。这道题我也没弄出来

ejason

第二题的5种，
解题是：设1-6为从矮到高六个人，根据题目要求，
1必须为前排最左，6必须为后排最右，
那么，2,3,4,5的排列只有如下几种情况：
后排 456，  356， 246， 256， 246
前排 123，  124， 125， 134， 135

徐小鱼

谢谢楼上的nn，还有两道题，有没有人能告诉我怎么做。。。

徐小鱼

悲惨的自己顶一下，29号考，竟然换题库了。。。