GRE
x
20
The number of combinations of $$3m$$ objects taken $$m+9$$ at a time
The number of combinations of $$3m$$ objects taken $$2m-9$$ at a time
3
The length of metal rod M
The length of metal rod R
The distance of PT
The distance of QT
|$$-b^{3}$$|
$$-b^{3}$$
$$||x| – |y||$$
$$|x – y|$$
|$$m$$| - |-$$k$$|
|$$k$$| - |-$$m$$|
0
$$x$$
$$6$$
k
r
|a+b|
5
25000 +道题目
7本备考书籍