OG13TH DS 135和136两题不懂 求助~~~

简单的豆

OG13--136 DC
if ○ represents one of the operations +,-,and*，
is k ○ (l+m)=(k ○ l)+(k ○ m) for all numbers k,l,m
1) k ○1,is not equal to 1 ○ k for some number k.
2) ○ represents subtrsction .
correct answer is D

OG13--135 DC
A school administrator will assihn each student in a group of n students to one of m classrooms.
If 3<m<13<n, is it possible to assign each of the n student to one of the m classrooms,
so that each classroom has the same number of students assigned to it?
1)It is possible to assign each of 3n students to one of m classrooms
so that each classroom has the same number of students assigned to it.
2)It is possible to assign each of 13n students to one of m classrooms
so that each classroom has the same number of students assigned to it.
correct answer is B
这两个题目可以有人翻译一下么···？我题目都没怎么看得懂······然后在解释下怎么做···看了半天OG后面的解释还是不懂啊·······真捉及······先谢谢各位了！！！

jeffjarrett

1.如果小圆圈代表+-*运算符号的一种， k ○ (l+m)=(k ○ l)+(k ○ m)是否满足所有的k，l，m

条件1：只有/和-满足，但是题目中说明了小圆圈只代表+-*，因此这里只能是-号          S
条件2：直白的无法直视                                                           S

选D

2.这题就是要把n个学生可以分配到m个教室，且3<m<13<n，是否每个教室的人都相同。其实考察的就是整除和余数的概念。

条件1：3n个学生可以分配到m个教室里
也就是说在3n可以被m整除时,n是否能被m整除。 由于3n是m的倍数, 当3n=42,n=14,m=6时,3n/m可以整除,但是n/m不行.因此条件1NS.

条件2: 13n个学生可以分配到m个教室里
同理, 因为n>13>m,所以这个条件成立  

因此选b

简单的豆

thx so much!