GRE
$$(x-y)^{2}$$
$$x^{2}+y^{2}$$
The number of the subsets of $$S_8$$
The number of the subsets of $$S_9$$ that contain the integer $$9$$
x
y+z
x+y
90
$$(a-b)^{2}$$
$$(a+b)^{2}$$
The remainder when $$k^{2}$$ +n is divided by 2
The remainder when $$k^{n}$$ is divided by 2
The remainder when $$3^{64}$$ is divided by 8
1
$$p+st$$
$$s(p+t)$$
25000 +道题目
236本备考书籍