GRE
$$P+Q+3$$
$$Q+R-3$$
The sum of the areas of the three shaded regions
4π
The number of different 2-member subsets of a set of 5 members
The number of different 3-member subsets of a set of 5 members
The number of different groups of 2 kittens that can be chosen from a litter of 8 kittens
The number of different groups of 6 puppies that can be chosen from a litter of 8 puppies
The probability that neither event E nor event F occur
0.20
The area of circle C
13π
The perimeter of triangle AOB
$$\frac{5d}{3}$$
25000 +道题目
245本备考书籍