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 $$2a$$
25000 +道题目
247本备考书籍