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
我没有OG13呢，仅说下我的看法哈~~~ OG13--136 DC 这一题：○ 代表+,-,and*三种运算 选项1说，k ○1,is not equal to 1 ○ k for some number k，则可以说明○代表的不是+和*，而是减法运算。带回到等式，可得k-(l+m)=(k - l)+(k-m)不是对所有k,l,m都成立（除非K=0），因此选项1充分 选项2说，○ 代表减法运算，则同样证明k-(l+m)=(k - l)+(k-m)等式不是对所有k,l,m都成立；因此选项2也充分
OG13--135 DC 我理解的这个题目的意思是说，n个学生分配到m个教室，如果每个教室人数相同，设n/m=A,则A肯定为整数。 选项1,3n/m为整数，因为3<m<13<n，假如m=6,n=14,则n/m不为整数；假如m=6,n=18,n/m为整数。 所以选项1不充分
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发表于 2012-8-19 07:03:39
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