GRE
$$a^{c-d}$$
$$b^{d-c}$$
The number of positive factors of k, including 1 and k
4
The remainder when ($$123^{4}$$-$$123^{3}$$+$$123^{2}$$-123) is divided by 122
2
The number of values of n that satisfy the three conditions
$$a^{2}$$+$$(\frac{1}{a})^{2}$$
3
25000 +道题目
196本备考书籍