GRE
s+2
|t|
$$x^{2} - y^{2}$$
5
The number $$b$$ such that $$f(b)$$ is the minimum value of $$f$$
$$-3$$
$$(27)^{-8}$$
$$(81)^{-6}$$
$$x^{-1}yz^{-2}$$
$$(\frac{xz}{y})^{-2}$$
The average (arithmetic mean) of x and y
y-1
25000 +道题目
245本备考书籍