GRE
$$(-87)^{8}$$
$$(\frac{1}{87})^{-8}$$
$$\frac{111}{1,111}$$
$$\frac{1,111}{11,111}$$
The number of kilometers in a light-hour
$$10^{10}$$
The standard deviation of data set X
The standard deviation of data set Y
$$\frac{(5!+6!)}{(6!+7!)}$$
$$\frac{1}{6}$$
x
112
m
130
25000 +道题目
236本备考书籍