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As shown in the figure, point C is on the number axis, and AC: BC = 1:5, find the number corresponding to point C. 2) if a starts from a and B at the same time, the speed of a is 3 times slower than that of A Bit / s, meet 2 units from the origin, the equation graph is a straight line, a is - 10, B is 14
Although I don't have a plan, I'm smart. That's right. Trust me
If AC: BC = 1:5, then AC = 24x1 / 6 = 4
C＝－6
Let a be x units per second and B be x + 3,
If we meet at 2, X: (x + 3) = 12:12, it's impossible
If we meet at - 2, X: (x + 3) = 8:16, x = 3, B x + 3 = 6
1. Let C be x, AC = x - (- 10) = x + 10, BC = 14-x
AC:BC=(x+10):(14-x)=1:5
The solution is: x = - 6
2. Let the ground velocity be x unit / s
B's velocity is 3 + X units per second
According to the Title Meaning: after t second B movement to the distance of 2 units
（3+x)t=14+2=16
(3+x+x)t=14-(-10)=24
It is known that O is the origin of the number axis, and the corresponding numbers of a and B are 1 and 2 respectively. Let P1 be the midpoint of AB, P2 be the midpoint of AP1, and P100 be the midpoint of ap99
Let the number corresponding to PI be AI, (1)
ninety-nine point five
Given that there are two points a and B on the number axis, the distance between a and B is 2, and the distance between B and origin o is 4, find the sum of the distances between a and origin o that meet the conditions
When the number of point B is 4, the number of point a is 4 + 2 = 6 or 4-2 = 2; when the number of point B is - 4, the number of point a is - 4 + 2 = - 2 or - 4-2 = - 6; the sum of distances between all points a and origin o is 6 + 2 + 2 + 6 = 16
The origin of known number axis is o. point a is 2, point B is minus half
1. What figure is the number axis?
What is the origin of the figure on the left?
3. What is the part of the number axis that is not less than negative half and not more than 2, and how to express it?
1、
The number axis is a straight line with direction
2、
The part on the left of the axis, including the origin, is a ray
It means x ≤ 0
3、
It's a line segment
It means ab
The complete square formula of the first volume of the second day of the people's education press. When using these two formulas, do you need to take the symbols before the numbers together for calculation?
(a+b)²=a²+2ab+b² （a-b）²=a²-2ab-b²
It's more troublesome to use this formula, but it's not easy to make mistakes
On the calculation of the power of addition, subtraction, multiplication and division
1.125*3+125*5+25*3+25 2.9999*3+101*11*(101-92) 3.(23/4-3/4)*(3*6+2) 4. 3/7 × 49/9 - 4/3 5. 8/9 × 15/36 + 1/27 6. 12× 5/6 – 2/9 ×3 7. 8× 5/4 + 1/4 8. 6÷ 3/8 – 3/8 ÷6 9. 4/7 × 5/9 + 3/7 × 5/9...
Function y = 1-2sin * 2x + 2sinxcosx 'to find the minimum positive period' range
y=1-2sin*2x+2sinxcosx
=cos2x+sin2x
=√2sin(2x+π/4)
Minimum positive period T = 2 π / 2 = π
Range [- √ 2, √ 2]
π. 2 under positive and negative root sign
Let P = f / s
P-pressure-pa
F
S
Understand
1. Speed formula of uniform linear motion: v = s / T, distance: S = VT, time: T = s / V 2, speed formula of variable speed linear motion: v = s / T 3, relationship between weight and mass: g = Mg (g = 9.8N / kg) 4, definition formula of density: ρ = m / V, mass of material: M
Mixed operation of addition, subtraction, multiplication and division
I need 80 questions fast
The range of the function y = 2sinxcosx-1, X ∈ R is______ .
Y = 2inxcosx-1 = sin2x-1 ∵ - 1 ≤ sin2x ≤ 1 ∵ - 2 ≤ sin2x-1 ≤ 0, so the answer is [- 2, 0]
RELATED INFORMATIONS
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- 2. On the number axis, points a and B represent rational numbers a and B respectively, and the origin o is just the midpoint of AB, then the value of (a + b) 100 + (A / b) 2008 is (a + b) 100 (A / b) 2008
- 3. On the number axis, the distance from point a to the origin is 3, and the distance from point B to the origin is 4
- 4. A point on the number axis that represents an integer is called an integral point. The unit length of a certain number axis is 1 cm. If you draw a line AB with the length of 2008 cm randomly on the number axis
- 5. On the number axis, point a stands for negative 6, and point B stands for positive 4. Please divide line AB into five equal parts, and the point is cdef from left to right. Write down the numbers they represent
- 6. The moving point a starts from the origin and moves along the negative direction of the number axis, while the moving point C on the number axis always moves along the number axis at a speed of 10 unit length / s Moving point a starts from the origin and moves in the negative direction along the number axis, while moving point B also starts from the origin and moves in the positive direction along the number axis. After 4 seconds, the two points are 20 unit lengths apart. It is known that the velocity ratio of moving point a and B is 2:3 (1). Calculate the velocity of two moving points (2). If two points a and B start from the positions marked in (1) at the same time, they move in the negative direction along the number axis according to the original velocity, A few seconds later, the origin is just in the middle of the two moving points (3) on the number axis, and the moving point C has been moving along the number axis at a speed of 10 unit length / second. When a and B start from the position marked in (1) and move in the negative direction of the number axis, the moving point will catch up with a and then return to B, and then reverse a when B meets. In this way, when B catches up with a, C stops moving immediately, How many unit lengths does point C move
- 7. The number corresponding to point a on the number axis is - 5. Point B is on the right side of point A. electronic ant a and B move to the left at the speed of 2 units / s and 1 unit / s respectively in B. electronic ant a and B move to the left at the speed of 1 unit / s Ant C moves to the right at a speed of 3 units per second Let the time of their simultaneous departure be T seconds. Is there a value of t so that the distance between C and B is twice that between C and a? If there is a value of T, please explain the reason
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- 12. Given that points a, B and C are three points on the number axis, the number corresponding to point C is 6, BC = 4, ab = 12. (1) find the number corresponding to points a and B. (2) the moving points P and Q start from a and C at the same time. They move along the positive direction of the number axis at the speed of 6 units per second and 3 units per second, respectively. M is the midpoint of a and P, n is on C and Q, and CN = one third CQ. Let t (T > 0) be the moving time, When the number corresponding to n (expressed by the formula containing T) is the value of T, OM = 2bn
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- 16. 7 6 2 8 9 1 6 2 is 24 points Space in the middle
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