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题目内容
A rectangle is formed by increasing two opposite sides of a square of side length x by y units, and decreasing the two remaining sides of the square by y units. What is the area of the rectangle?
The net profit that Ann makes from selling x pillows is given by the expression $$x^{2} – 2x – 288.$$

Quantity A

The number of pillows that Ann must sell for her net profit to be zero

Quantity B

20


What is the greatest value of x for which (3x – 2)(x + 1) = 0 ?
$$x^{2}=y^{2}+1$$ and $${y}\neq{0}$$

Quantity A

$$x^{4}$$

Quantity B

$$y^{4}+1$$


The solutions of $$x^2$$ + x – 20 = 0 are Indicate all possible values.
If x is positive and y is 1 more than the square of x, then what is the value of x in terms of y ?
$$x^{2}-49=0$$

Quantity A

$$x^{2}-7x$$

Quantity B

-7x+49


For $$x\neq-2 and x\neq-4,\frac{x}{x+4}+\frac{-3}{x+2}=$$
$$a\neq-b$$

Quantity A

$$\frac{6a^{2}+12ab+6b^{2}}{a+b}$$

Quantity B

6((a+b)


Quantity A

$$(141)^{2}-(28)^{2}$$

Quantity B

$$(141-28)^{2}$$


(–x + y)(–y + x) =
x ≥ 0y ≥ 0

Quantity A

$$\sqrt{x^{12}}-y$$

Quantity B

$$(x^{3}+\sqrt{y})(x^{3}-\sqrt{y})$$


Quantity A

$$(s+t)^{2}$$

Quantity B

$$s^{2}+t^{2}$$


$$x^{2}-2xy+y^{2}=0$$ and $$y=\frac{9}{x}$$

Quantity A

y

Quantity B

3


If $$\frac{x^{2}-4x+4}{x^{2}+x-6}=\frac{6x-12}{x^{2}+6x+9}$$, then x =__________
If y = $$x^2$$ – 32x + 256, then what is the least possible value of y ?
A certain recipe calls for 2 cups of sugar and $$3\frac({1}{2})$$ cups of flour. What is the ratio of sugar to flour in this recipe?
What is the approximate ratio of Company F`s average annual donation to charity group X for the period 1980–1990 to that for the period 1980–2000? GRE、gre题库、gre模考、gre考满分
If a certain vitamin pill has 400 milligrams of magnesium, then how many grams of magnesium are in a bottle of 500 vitamin pills? (1 gram = 1,000 milligrams)
$$a=\frac{1}{6} and \frac{6}{7}=\frac{5}{b}$$,what is the value of a + b ?

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