|
191020
|
The long sides of two identical right triangles are put together to form a quadrilateral with an angle of 60 degrees.The shortest side of the right triangle is 3 and what is the area of the quadrilateral?
|
|
191020
|
A person's sales volume is within 10 orders, his salary is 300 yuan; sales volume is 10-20 orders, his salary is 200 + sales volume*10; sales volume is greater than or equal to 20 orders, his salary is 300 + sales Volume*20. How much did he sell last month?
(1). This person's salary this month is 10 yuan more than last month
(2). This person has 2 more orders this month than last month
|
|
191020
|
Is x^y>1？
(1). x>1
(2). y<1
|
|
191020
|
One orange, two apples, and three bananas are $3.50 in total. How much is one banana?
(1). 1 apple = 2 oranges + $0.25
(2). 5 oranges + 3 bananas = $3
|
|
191020
|
Is n odd?
(1)5n is divisible by 7
(2)3n is divisible by 5
|
|
191020
|
If $$\frac { 1 } { ( 2 n - 1 ) ! } - \frac { 1 } { ( 2 n + 1 ) ! } = \frac { a n ^ { 2 } + b n + c } { ( 2 n + 1 ) ! }$$, so a+b+c=?
|
|
191020
|
$$\frac { 1 } { 1 + 2 + 3 + 4 } + \frac { 1 } { 1 + 2 + 3 + 4 + 5 } + \ldots \ldots \frac { 1 } { 1 + 2 + 3 + \ldots + 99 } = ?$$
|
|
191020
|
f(s)=$$\frac { 1 } { 4 } * s * t ^ { 2 }$$，and s= $$ 4^ { t }$$，so f(64)=?
|
|
191020
|
What is the units digit of $$2^{345} +1$$?
|
|
191020
|
Is 2n+1 a multiple of 3?
(1)the remainder is 1 when n is divided by 3
(2)the remainder is 4 when n is divided by 6
|
|
190215
|
The radius of all three circles is r. The top circle is tangent to the bottom two circles. The closest distance between two points on the circumferences of the bottom two circles is a. These three circles are tangent to the quadrilateral ABCD. How is BC represented by r and a?
|
|
190215
|
If a coin is even, and the possibility of the occurrence of showing the head and the tail are equal. What is the probability that the head shows up at least one time?
|
|
190215
|
The building materials factory produces two sizes of columns. The cross-sectional area of a large cylinder is three times that of a small cylinder. How many times the radius of the bottom of a large cylinder is that of a small cylinder?
|
|
190215
|
There are five seats in the classroom. How many different arrangements are there for five students?
|
|
190215 还原机经选题: 数论&代数
|
$$\frac{0.00048*10^{n}}{4^{2}}$$ < 2*10^{18}.n is an integer. What is the maximum value of n?
|
|
190215
|
Which of the following options has the standard deviation greater than that of the sequence {- 20, - 10,0,10,20}?
|
|
190215
|
In the rectangular coordinate system, the center of a circle is the origin and the radius is r. The center of the other circle is (1,1) with a radius of R. Is the distance between the centers of two circles r + R?
1:$$r^{2}$$+$$R^{2}$$-=2(1-rR)
2:$$R^{2}$$-$$r^{2}$$=2r
|
|
190215
|
Someone wants to buy n apples. She has two plans. The first option is to buy a basket of apples for $6. The second option is to buy one by one, and the price of each apple is $0.32. Is the first plan more cost-effective than the second?
1: n less than 20
2: n + 4 apples can be bought with $7.04 in the second way.
|
|
190215
|
In a scenic spot, adult tickets and child ticket accounted for 60% and 40% of the tickets sold in one year. Sales of adult tickets were 75% of the total turnover. Which of the following may be the selling unit price of adult ticket and child ticket?
|
|
190215
|
Is $$x^{4}$$ < $$x^{2}y^{2}$$ ?
1：$$x^{2}$$ < $$\frac{1}{4}$$
2：$$x^{2}$$ < $$\frac{x}{4}$$
|