GRE
$$\sqrt{( 10^{2m} )}\sqrt{( 10^{2n} )}$$
$$10^{mn}$$
$$(-1)^{n}(-1)^{n+2}$$
1
The remainder when the sum of $$1999^{m}$$ and $$2001^{m}$$ divided by 7
4
x*y
x + y
The standard deviation of the 30 ratingss
17
25000 +道题目
155本备考书籍