GRE
$$(a+a^{-1})^{2}$$
$$a^{2}$$+$$a^{-2}$$
$$y$$
$$1$$
The number of points in the plane that are equidistant from all the three lines k, m, and p
3
$$QR$$
$$RS$$
$$z$$
($$\frac{2}{3}$$@$$\frac{2}{3}$$)@$$\frac{2}{3}$$
$$\frac{2}{3}$$@($$\frac{2}{3}$$@$$\frac{2}{3}$$)
25000 +道题目
236本备考书籍