#### 题目列表

The average (arithmetic mean) of x , y and 15 is 9.

#### Quantity A

Average of x and y

#### Quantity B

16

W, X, Y and Z each represent a different number. If the sum of each column is shown beneath that column, and the sum of each row is shown beside that row, then n =
The system of equations has how many solutions?

3x - 6y = 9

2y - x - 3 = 0
The average (arithmetic mean) of y numbers is x. If 30 is added to the set of numbers, then the average will be x - 5. What is the value of y in terms of x ?
If |x + 5| = 3 and $\frac{|2y-1|}{3}=5$, then |x + y| could equal each of the following EXCEPT
If f(x) =$12-\frac{x^2}{2}$ and f(2k) = 2k, what is one possible value for k?
If A, B, C and D are positive integers such that 4A = 9B, 17C = 11D, and 5C = 12A, then the arrangement of the four numbers from greatest to least is
If 3x < 2y < 0, which of the following must be the greatest?
If$x^{2}+y^{2}=12$, then $\frac{x}{y}+\frac{y}{x}=$
If xy = 7 and x - y = 5, then $x^{2}?+y^{2}?=$
$If \frac{8-x}{x+1}=x,then x^{2}+2x-3=?$
If A is the initial amount put into an account, R is the annual percentage of interest written as a decimal, and the interest compounds annually, then which of the following would be an expression, in terms of A and R, for the interest accrued in three years?
When positive integer x is divided by 11, the quotient is y and the remainder is 4. When 2x is divided by 8, the quotient is 3y and the remainder is 2. What is the value of 13y – x ?
$If (\frac{1}{x}+x)^{2}=16$,then $\frac{1}{x^{2}}+x^{2}=$
If 5x - 3y = 7 and 2y - 4x = 3, then 2x - 2y =
For all numbers a and b, the operation is defined by a ⊕ b = $a^2 - ab$. If xy ≠ 0, then which of the following can be equal to zero?

I. x ⊕ y

II. xy ⊕ y

III. x ⊕ (x + y)
$If 8^{n+1}+8^{n}=36$,, then n =
If f(x) = 5 - 2x and f(3k) = f(k + 1), then f(k) =
What is the sum of all possible solutions of the equation

$|x+4|^{2}-10|x+4|=24$
What is the sum of all possible solutions to the equation

$\sqrt{2x^{2}-x-9}=x+1$
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