GRE
n
33
P (R <1.375x)
P (T <1.25x)
$$\frac{n!}{(\frac{n}{2})!}$$
2($$\frac{n}{2}$$)!
$$x$$
$$y$$
The area of a circular region with radius $$r$$
The area of a circular region with radius $$r^{2}$$
The number of integer solutions of the equation $$3x^{2}+5x-2=0$$
1
25000 +道题目
236本备考书籍