GRE
4 times the number of integers in set T that are multiples of 4
5 times the number of integers in set T that are multiples of 5
$$(27)^{-8}$$
$$(81)^{-6}$$
The number of different prime factors of 500
The number of different prime factors of 360
r+t
12
$$QR$$
$$RS$$
$$2^{-2002}$$ + $$2^{-2003}$$
$$2^{-2004}$$
25000 +道题目
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