GRE
$$\frac{1}{3}$$(PR)
PS
$$\frac{1}{x}$$+$$\frac{1}{y}$$
$$x+y$$
$$(\frac{1}{2})^{n}$$
$$(\frac{1}{3})^{n}$$
The number of positive factors of 87
The number of positive factors of 97
The number of unique prime factors of 27
The number of unique prime factors of 12
$$2^{x}$$+$$2^{x}$$+$$2^{x}$$+$$2^{x}$$
$$4^{x}$$+$$4^{x}$$
The angle opposite to the longest side of the triangle
90°
RS
$$a^{c-d}$$
$$b^{d-c}$$
25000 +道题目
236本备考书籍