GRE
$$1+\frac{2}{k}+\frac{3}{k^2}$$
3
x+y
x-y
$$\frac{r}{r^2+1}$$
$$\frac{1}{r}$$
The number of integers in the set H ∩ F
6
The number of prime numbers from k to k+10
The number of prime numbers from k+10 to k+20
The area of the region between P and Q
The area of the region between Q and R
The area of a right triangle with hpotenuse of length c and a leg of length a
The area of a right triangle with hpotenuse of length c and a leg of length 2a
The product of n and p
144
The number of rolls sold between opening time and noon
The number of rolls sold between noon and closing time
b-a
a-c
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199本备考书籍