GRE
$$x^{2} - y^{2}$$
5
$$(27)^{-8}$$
$$(81)^{-6}$$
The average (arithmetic mean) of x and y
y-1
The diameter of the circular region
$$\sqrt{20}$$
The area of a square region with diagonal of length $$\sqrt{2}x$$
The area of a circular region with diameter of length x
25000 +道题目
236本备考书籍