GRE
$$(4x)(3(-2x+1))$$
$$(4)(3x)(1-2x)$$
$$n^{2}$$
4m
$$x$$
$$y$$
x+y-1
x-y+1
x
y
The area of a circular region with radius $$r$$
The area of a circular region with radius $$r^{2}$$
$$5^{-x}$$
1
The number of positive even integers less than 100, each of which is the square of an integer
The number of positive odd integers less than 100, each of which is the square of an integer
112
c
3
m
130
The sum of the first 99 terms of the sequence
The last term of the sequence
25000 +道题目
6本备考书籍