GRE
The number of sequences in S in which f, b, h, and g appear consecutively in that order
The number of sequences in T in which f and b appear consecutively in that order
$$\frac{rs}{t}$$
$$rst$$
$$x$$
$$90$$
The length of line segment AC
The length of line segment BE
$$k$$
$$m$$
The area of the region enclosed by the polygon
$$42x$$
The standard deviation of $$x+1$$, $$y+1$$, and $$z+1$$
$$d+1$$
$$3^{2y}$$
$$3^{-2y}$$
25000 +道题目
236本备考书籍