GRE
5,555,555*777,777,777
7,777,777*555,555,555
2x-8
x+2
m+5
8-n
$$\frac{1}{2}(x+y)$$
$$\frac{1}{2}$$x + y
R
10
The radius of $$C_1$$
Twice the radius of $$C_2$$
The greatest prime factor of N
15
The percent increase in the dollar value of the antique from 1980 to 1984
56%
The average of the r + t integers in lists A and B
17.5
25000 +道题目
198本备考书籍