GRE
$$\frac{(a+b)^{2}-b^{2}}{a+2b}$$
$$a$$
r
12
$$T_5$$
$$(3^{11}) T_{16}$$
The sum of the areas of triangular regions ABC and CDE
The area of triangular region ACE
The length of a diagonal of S
The length of a diameter of C
$$2^{x}$$
$$2^{-x}$$
x+y
x-y
25000 +道题目
245本备考书籍