展开全部

题目列表

题目内容
In many branches of science, our knowledge and technology have advanced so rapidly that new studies carried out with improved instruments and techniques may well ____________ research done just twenty years earlier.
$$T_1, T_2, T_3, ........., T_k, .........$$

The sequence shown is defined by $$T_1=2$$ and $$T_{k+1}=\frac{1}{3}T_k$$ for each positive integer k.

Quantity A

$$T_5$$

Quantity B

$$(3^{11}) T_{16}$$




Quantity A

The area of triangular region XYZ

Quantity B

The area of triangular region KLM






As part of a study, a restaurant recorded the number of people for each reservation at the restaurant last Saturday. The table above shows a frequency distribution of the results. What is the range of the numbers of people per reservation?

_____people per reservation
On the first day of a sale, a storekeeper sold $$\frac{3}{5}$$ of the goods in the initial inventory. On the second day of the sale, the storekeeper sold $$\frac{1}{4}$$ of the goods that remained at the end of the first day of the sale.

Quantity A

The fraction of the goods in the initial inventory that remained at the end of the second day of the sale

Quantity B

$$\frac{3}{10}$$






The median of the scores on exam 1 was how much higher or lower than the median of the scores on exam 2?
One of the 15 students had a total score of 182 on the two exams. What is the weighted mean of that student's two scores if the score on exam 1 has a weight of 40 percent and the score on exam 2 has a weight of 60 percent?
A pair of students is to be chosen to write a certain report, and each of the chosen students must have a total score of 170 or higher on the two exams. How many different pairs of students meet this requirement?
1, 2, 3, ......, m

1, 2, 3, ......, n

The first sequence consists of m consecutive integers, and the second sequence consists of n consecutive integers, where m is even and n is odd.

Quantity A

The percent of integers in the first sequence that are odd

Quantity B

The percent of integers in the second sequence that are even


x ≠ y and y ≠ 0

Quantity A

$$\frac{x+y}{y}$$

Quantity B

$$\frac{x^{2}-y^{2}}{xy-y^{2}}$$


When randomly selecting an integer from 11 to 50, inclusive, what is the probability that the selected number is a multiple of both 2 and 3?
w, x, y, and z are consecutive positive multiples of 6.

Quantity A

$$\frac{w+z}{2}$$

Quantity B

$$x+\frac{z-y}{2}$$


x is even, y is odd, which of the following could be even?

Indicate all such statements.
x, y, z are consecutive positive integers and x < y < z.

Quantity A

$$(\frac{1}{x}-\frac{1}{y})^{-1}$$

Quantity B

$$(\frac{1}{y}-\frac{1}{z})^{-1}$$


In an appliance store, the ratio of the number of radios in stock to the number of television sets in stock is 0.4. Exactly 10 radios and x television sets are added to the appliances in stock, and the ratio of radios to television sets in stock remains at 0.4.

Quantity A

x

Quantity B

30


y is a positive even integer.

Quantity A

x+y

Quantity B

x+1


For all x, $$x^{2}+4x-12 = (x-r)(x+s)$$, where r > 0 and s > 0.

Quantity A

r

Quantity B

s


x and y are integers and 0 < x < y.

Quantity A

$$x^{y}$$

Quantity B

$$y^{x}$$




O is the center of the circle, and OA = BC.

Quantity A

The measure of angle ABC

Quantity B

60°






Two sides of a right triangle have lengths of 5 and 10, respectively.

Quantity A

The length of the third side of the triangle

Quantity B

11




共收录:

25000 +道题目

198本备考书籍

最新提问