GRE
The average of the least and greatest numbers in list S
6
$$\frac{r}{x}$$
n-2
n
52
d
s
The number of integer solutions of the equation $$3x^{2}+5x-2=0$$
1
r-p
t-s
The number of possible values of n
18
The length of chord PQ
r
25000 +道题目
5本备考书籍