GRE
$$(x+1)^{2}$$
12
$$x^{3}$$+$$\frac{1}{x^{3}}$$
x+$$\frac{1}{x}$$
The mean of the 7 numbers
x
x+y
$$\frac{1}{x}$$+$$\frac{1}{y}$$
ab
b-a
6s
5t
m(n+p)
mn+p
$$\frac{1}{x}$$+$$\frac{2}{x}$$+ $$\frac{3}{x}$$
x +$$\frac{x}{2}$$+ $$\frac{x}{3}$$
The sum of the reciprocal of x and the reciprocal of y
1
(x+y)(r+t)
r+t(x+y)
The average of a, b and c
$$\frac{1}{2}$$
r
0
7+$$10^{m}$$
5+$$10^{n}$$
25000 +道题目
198本备考书籍