GRE
$$\frac{1}{3^{n}}$$
$$3(\frac{1}{4^{n}})$$
$$(x-y)^{2}$$
3
$$\frac{1}{x}$$
$$\frac{1}{y}$$
The percent of the employees at Company X yesterday who did not leave for the day before 6 P.M
20%
RS
TU
The sum of the first 99 terms of the sequence
The last term of the sequence
$$x^{2}$$+$$\frac{1}{x^{2}}$$
$$x^{3}$$+$$\frac{1}{x^{3}}$$
25000 +道题目
236本备考书籍