#### 题目列表

When delivering 104 total pieces of newspaper for a community, the number of households that subscribe to 3 pieces of newspaper is twice as many as the number of household that subscribe to 1 piece of newspaper, while the number of households that subscribe to 2 pieces of newspaper is three times as many as the number of household that subscribe to 1 piece of newspaper. What is the number of households that subscribe to 2 pieces of newspaper?

In a right isosceles triangle, the area of the shaded region is 44,BD=CE=4,and AC=AB,what is the length of AC?
x and y are both integers If 4 ≤ x < 7 < y ≤ 12, then what`s the range of $(x-y)^{2}$?
n > 2
List M={2, n, n, n}
List N={2, 2, 2, n}

#### Quantity A

The standard deviation of List M

#### Quantity B

The standard deviation of List N

For each value x in a list of values with mean m, the absolute deviation of x from the mean is defined as |x-m|.

A certain online course is offered once a month at a university. The number of people who register for the course each month is at least 5 and at most 30. For the past 6 months, the mean number of people who registered for the course per month was 20. For the numbers of people who registered for the course monthly for the past 6 months, which of the following values could be the sum of the absolute deviations from the mean?

Indicate all such values.
Two water faucets are used to fill a certain tank. Running individually at their respective constant rates, these faucets fill the empty tank in 12 minutes and 20 minutes, respectively. If no water leaves the tank, how many minutes will it take for both faucets running simultaneously at their respective rates to fill the empty tank?

The cubic root of which of the following number is $\sqrt[3]{3}$+$\sqrt[3]{192}$+$\sqrt[3]{375}$?
If x is an integer, then what is the least possible value of $3^{x}$ + $3^{-x}$ ?