GRE
The tens digit of ($$4^{100}$$)($$5^{99}$$)
The tens digit of ($$4^{100}$$)($$5^{101}$$)
The ratio of the cost of 1 of the health magazines to the cost of 1 of the news magazines
$$\frac{4}{5}$$
$$a^{2}$$+$$(\frac{1}{a})^{2}$$
3
25000 +道题目
245本备考书籍