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题目内容
x and y are integers and $$x^{2} -y^{2} =27$$

Quantity A: x

Quantity B: 10
The number 1112131415......484950 is formed by two-digit integers from 11 to 50

Quantity A: the 26th digit (from left to right) of the number

Quantity B: the 45th digit (from left to right) of the number
The sum of n consecutive integers is 30

Quantity A: n

Quantity B: 4
Line l is parallel with line m, EF = CD, FG = AB

Quantity A: the area of trapezoid ABCD

Quantity B: the area of △EGH

Set A={0.2, 0.4, 0.6, 0.8}

Set B={1,2,3,4}

Quantity A: The standard deviation of numbers in Set A

Quantity B: The standard deviation of numbers in Set B
The price of a product was $a in 2001, the price increased 10% in 2002, and decreased 5% in 2003.

Quantity A: the percent increases(or decreases) from 2001 to 2003

Quantity B: 5%
Quantity A:x

Quantity B:y

Two parallel lines are intersected by a third line.

Quantity A: The number of points that have the same distance with all the three lines

Quantity B: 3
Which of the following value is closest to $$\sqrt{79}$$ ?
10.If x=$$10^{6}$$-1, which of the following is not the factor of x?
11.What is the probability when a number formed by at least one 6 on all digits is selected from 1 to 1,000 (inclusive)?
A teacher has three courses in total. The average number of students who sign up for each course is 32. Among these students, 5 students sign up for 2 courses, 3 students sign up for all the three courses. How many different students sign up for the three courses in total?
A, B, C, D, and E need to take seats such that A and B sit next to each other. How many ways can they arrange the seats?
Which of the following could be the value of x to make sure that $$x^{3}$$ - x is divisible by 10?

Indicate all such values.

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