|
191222
|
It is defined that x@y=ax+by, what is the value of 8@2=？
1：4@1= 9
2：2@2= 6
|
|
OG19-数学分册
|
In the xy-plane, lines k and € intersect at the point (1, 1). Is the y-intercept of k greater than the y-intercept of € ?
(1) The slope of k is less than the slope of € .
(2) The slope of € is positive.
|
|
PREP07 Test 2
|
If n is a positive integer and r is the remainder when (n – 1)(n + 1) is divided by 24, what is the value of r?(1) 2 is not a factor of n.(2) 3 is not a factor of n.
|
|
OG18 OG19 OG20 OG2022
|
If a sphere with radius r is inscribed in a cube with edges of length e, which of the following expresses the relationship between r and e ?
|
|
OG18-数学分册
|
An airline passenger is planning a trip involves three connecting flight that leave from Airports A, B, and C, respectively. The first flight leaves Airport A every hour, beginning at 8:00 a.m., and arrives at Airport B $$2\frac{1}{2}$$hours later. The second flight leaves Airport B every 20 minutes , beginning at 8:00 a.m.,and arrives at Airport C $$1\frac{1}{6}$$ hours later. The third flight leaves Airpoort C every hour, beginning at 8:45 a.m. What is the least total amount of time the passenger must spend between flights if all flights keep to their schedules?
|
|
OG19-数学分册
|
An airline passenger is planning a trip that involves three connecting flights that leave from Airports A, B, and C, respectively. The first flight leaves Airport A every hour, beginning at 8:00 a.m., and arrives at Airport B $$2\frac{1}{2}$$ hours later. The second flight leaves Airport B every 20 minutes, beginning at 8:00 a.m., and arrives at Airport C $$1\frac{1}{6}$$ hours later. The third flight leaves Airport C every hour, beginning at 8:45 a.m. What is the $$\underline {least}$$ total amount of time the passenger must spend between flights if all flights keep to their schedules?
|
|
|
If a + b = 24 and a = 3b, then $$\sqrt{a}+\frac{a}{b}=$$
|
|
|
Each of the numbers a, b, c, d is equal to -1, 0, or 1. What is the value of a + b + c + d?1. $$\frac{a}{2}+\frac{b}{4}+\frac{c}{8}\frac{d}{16}=\frac{1}{8}$$2. $$\frac{a}{4}+\frac{b}{16}+\frac{c}{64}+\frac{d}{256}=\frac{11}{64}$$
|
|
OG18-数学分册
|
For all numbers s and t, the operation * is defined by s * t =(s - 1)(t +1). If (- 2)* x = - 12, then x =
|
|
191031
|
Is the number of the roots of $$x^2-4x+c=0$$ greater than 1?
(1)C≥-4
(2)C≤4
|
|
Magoosh
|
If A is the initial amount put into an account, P is the annual percentage rate of interest, which remains fixed, and the account compounds quarterly, which of the following is an expression, in terms of A and P, for the amount in the account after 5 years?
|
|
|
If I and k are lines in the xy-plane, is the product of the slopes of I and k equal to -1 ?(1)Line I passes through the origin and the point (1, 2).(2)Line k has x-intercept 4 and y-intercept 2.
|
|
PREP07 Test 1
|
If p and n are positive integers and p > n, what is the remainder when $$p^2 - n^2$$is divided by 15 ?
(1) The remainder when p + n is divided by 5 is 1.
(2) The remainder when p - n is divided by 3 is 1.
|
|
300难题
|
In the standard (x,y) coordinate plane, what is the slope of the line containing the distinct points P and Q ?
1.Both P and Q lie on the graph of |x| + |y|=1.
2.Both P and Q lie on the graph of |x + y| = 1.
|
|
|
In the xy-plane, what is the slope of line l?(1)Line l does not intersect the line with equation y = 1 - x.(2)Line l intersects the line with equation y = x - 1.
|
|
|
If 0< x< 1,what is the median of the values x,1/x,x²,√x ,and x³?
|
|
OG19-数学分册
|
The sequence $$a_{1}$$, $$a_{2}$$, $$a_{3}$$, $$a_{4}$$,$$a_{5}$$ is such that
$$a_{n}=a_{n-1}+5$$ for $$2\leq n\leq 5$$. If$$ a_{5} = 31$$, what is
the value of $$a_{1}$$ ?
|
|
Ready4
|
What is the value of ?
|
|
OG15 OG16 OG17 OG18 OG19
|
Terry holds 12 cards, each of which is red, white, green, or blue. if a person is to select a card randomly from the cards Terry is holding, is the probability less than 1/2 that the card selected will be either red or white?(1) The probability that the person will select a blue card is 1/3.(2) The probability that the person will select a red card is 1/6.
|
|
OG18-数学分册
|
What is the ratio of $$\frac{3}{4}$$ to the product $$4(\frac{3}{4})$$
|