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Given that the image of the function y = x3-3x + C has exactly two common points with the X axis, then C =?
Wait a minute
Given that the graph of function y = x3-3x + C has exactly two points in common with X axis, then C = ()
A. - 2 or 2B. - 9 or 3C. - 1 or 1D. - 3 or 1
We can get y '= 3 (x + 1) (x-1) if y' > 0, we can get x ＞ 1 or X ＜ - 1; if y '< 0, we can get - 1 ＜ x ＜ 1; the function increases monotonically on (- ∞, - 1), (1, + ∞), and decreases monotonically on (- 1,1). We can get the maximum value at x = - 1 and the minimum value at x = 1. The image of function y = x3-3x + C and X axis have exactly two common points, and the maximum value is equal to 0 or the minimum value If 0 ﹣ 1-3 + C = 0 or - 1 + 3 + C = 0 ﹣ C = - 2 or 2, select a
A passenger car and a freight car run for 5 hours from a and B, which are 600 kilometers apart. The speed of a passenger car is 1.5 times that of a freight car
Let the speed of passenger car and freight car be 1.5x, X:
（1.5x+x)*5=600
12.5x=600
x=48
1.5x=72
Answer: the speed of passenger car and freight car is 72 km / h and 48 km / h respectively
If a (1,1) B (3,5) C (a, 7) are collinear, then a=
Using the knowledge of straight line and equation
First write the linear equation of any two points, and then substitute another point into the equation
as follows
Let the line passing a and B be y = KX + B
yes
1=K+b
5=3K+b
The solution is k = 2, B = - 1
So the linear equation is y = 2x-1
Obviously, point C is on the line
Then 7 = 2a-1
Then a = 4
Party A and Party B have 336 people in total, 5 / 7 of them are transferred to Party A and 3 / 7 of them are transferred to their own teams, 188 people in total?
(188*7-336*3)/(5-3)=154
336-154=182
New year's day in 2007 is Monday, so is national day in 2007______ ．
31 × 5 + 3 × 30 + 28 = 273; 273 ／ 7 = 39; every 7 days is a cycle, the new year's day in 2007 is Monday, the first day after 39 weeks, and the National Day in 2007 is also Monday
A. The distance between B and a is 450 km. A and B start from a and B at the same time and run in opposite directions. It is known that the speed of a is 120 km / h and that of B is 80 km / h. After t hours, the distance between two vehicles is 50 km, then the value of T is ()
A. 2 or 2.5B. 2 or 10C. 10 or 12.5d. 2 or 12.5
(1) When car a and car B do not meet, according to the meaning of the question, we get 120t + 80t = 450-50, and the solution is t = 2; (2) when the two cars meet and the distance between them is 50km, according to the meaning of the question, we get 120t + 80t = 450 + 50, and the solution is t = 2.5
If a:: C is 3:5 and B = 16, then what is a equal to?
If a is equal to 3x, then C is equal to 5x, and B is equal to 4x, because B is equal to 16, X is equal to 4, and a is 12
A and B drive from a to B at the same time. When a runs 2 / 5 of the whole journey, B runs 18 kilometers. When a arrives at B, a is still 9 kilometers away from B. find the distance between a and B
As the speed of car B remains the same, the driving distance and time are in direct proportion
For the first time, it takes 2 / 5 of the whole journey
Therefore, the time ratio of the two times is 2:5, so the two times driving distance of car B is also 2:5
When car a reaches the terminal, car B: 18 △ 2 / 5 = 45 (km)
At this time, there are still 9 km from the end point, so the whole journey is 45 + 9 = 54 (km)
If the sum of polynomials X & # 178; - 8x-1 and 3x & # 178; + 4x-n does not contain a constant term, then the value of N + 1 is?
Sum = x & # 178; - 8x-1 + 3x & # 178; + 4x-n
=4x²-4x-(n+1)
If there is no constant term, the constant term is 0
-（n+1)=0
n+1=0
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