GRE
|$$3+x-x^{2}$$|
|$$x^{2}-x-3$$|
$$\frac{1}{x}$$+$$\frac{2}{x}$$+ $$\frac{3}{x}$$
x +$$\frac{x}{2}$$+ $$\frac{x}{3}$$
h(h($$\frac{1}{9}$$))
10
The remainder when 5($$10^{n}$$) + 1 is divided by 3
1
$$(2m+1)^{2}$$
$$(2(m+1))^{2}$$
3x
$$\sqrt{45}$$
n
k +1
PS
RS
25000 +道题目
236本备考书籍