GRE
AB
BC
$$\frac{(3a)(3a)}{3}$$
$$\frac{3a+3a}{3}$$
A length of a side of the square
$$x^{2}-1$$
The ratio of the number students enrolled in German classes to the number of students enrolled in Spanish classes
$$\frac{3}{4}$$
$$(\frac{y}{x})\sqrt{\frac{x^{3}}{y}}$$
$$\sqrt{xy}$$
The area of the square
The perimeter of the square
The circumference of a circle of radius r.
The arc length of a semicircle of radius (r + 1).
2 times the number of ways 4 books can be arranged on a shelf.
The number of ways 6 books can be arranged on a shelf
The probability of rolling a die and getting a prime number
The probability of rolling a die and getting an odd number
$$(3^{-1}+3^{-2})^{-1}$$
1
||$$(\frac{1}{3})ab$$
a+b
The shaded area
The unshaded area
25000 +道题目
5本备考书籍