#### 题目列表

What is the value of $\frac{0.99999999}{1.0001}$ - $\frac{0.99999991}{1.0003}$?
x+y=7

x+2y

y+2x

3x+3 < 2y

x

y

z=x-2y

#### Quantity A

The average of x and z

x-y

xy+y < 0

Quantity A: x

Quantity B: y
0 < x < 1, n > 0

#### Quantity A

$\frac{n}{x}$

#### Quantity B

n

x is a real number

#### Quantity A

$\frac{x}{x+1}$

#### Quantity B

1

Quantity A:$(2m+1)^{2}$

Quantity B:$(2(m+1))^{2}$
2 < x < 5,$\frac{1}{10}$ < y < $\frac{1}{5}$

Quantity A: x+y

Quantity B: $\frac{1}{x}$+$\frac{1}{y}$

#### Quantity A

The square of the average of x,y and z

#### Quantity B

The average of $x^{2}$,$y^{2}$and $z^{2}$

0 < a< b < 1 < c < d, c and d are both integers

#### Quantity A

$a^{c-d}$

#### Quantity B

$b^{d-c}$

0 < x < y

#### Quantity A

x+$\frac{1}{x}$

#### Quantity B

y+$\frac{1}{y}$

x and y are positive real numbers

#### Quantity A

$\sqrt{(x^{2})(y^{5})}$

#### Quantity B

$\sqrt{(x^{3})(y^{5})}$

$x\geq 0$

Quantity A:$2^{x}+2^{x}+2^{x}+2^{x}$

Quantity B:$4^{x}+4^{x}$
x=$2^{50}$

y=$2^{50}$-1

z=$2^{50}$-2

#### Quantity A

$x^{2}$$z^{2}$

#### Quantity B

$y^{4}$

x > 0

#### Quantity A

$2^{4}$+$\sqrt{x}$

#### Quantity B

$4^{2}$+$\sqrt{x^{2}}$

#### Quantity A

$3^{12}$

#### Quantity B

$5^{8}$

The half-life period of 10 grams of a certain radioactive element is an hour. If the mass of the element drops to 0.1~1 grams after N hours, then N COULD be which of the following?

Indicate all such values.
If n is a positive integer and $0.5^{n}$ < 0.0002, what is the least possible value of n?
If a is an integer greater than 1, what is the possible value of $(1+\frac{1}{a})^{-1}$?
1 2 ... 5 6 7 8 9 10 11 ... 20 21

25000 +道题目

136本备考书籍