GRE
$$(a+a^{-1})^{2}$$
$$a^{2}$$+$$a^{-2}$$
m + n
2m
The remainder when $$3^{4n}$$ is divided by 10
1
The number of points (a, b) on circle C where both a and b are integers
The number of points (a, b) on circle D where both a and b are integers
The 40th percentile of the distribution of the values of x
40.5
$$QR$$
$$RS$$
$$(x-y)^{2}$$
$$x^{2}+y^{2}$$
25000 +道题目
236本备考书籍