Formula of runway problem (length)

Formula of runway problem (length)

s = v t
Distance = average speed * time
The solution of the equation 4x-2m = 3x-1 is twice that of x = 2x-3m
By solving the equation x = 2x-3m, we can get: x = 3M, by solving 4x-2m = 3x-1, we can get: x = 2m-1, ∵ the solution of the equation 4x-2m = 3x-1 about X is twice that of the equation x = 2x-3m, ∵ 2 × 3M = 2m-1, ∵ the solution of the equation 4x-2m = 3x-1 about X is twice that of the equation x = 2x-3m, we can get: M = - 14. A: when m = - 14, the solution of the equation 4x-2m = 3x-1 about X is twice that of the equation x = 2x-3m
Formula of circular runway problem and formula of bridge problem
And the profit and loss formula
Formula? It's no use reciting it. Generally, don't memorize it, but understand it. General circular track problem: A and B start at the same time, walk in the same direction, and one person is slow. How far or how much difference do they run when they meet for the first time? As long as you remember, the fast person must run one more circle than the slow person
Drawing
>In mathematics, if the solution of the equation 2x-a = 0 is 2 larger than that of the equation 4x + 5 = 3x + 6, the value of a is obtained
The solution x = 1 of 4x + 5 = 3x + 6
The solution of 2x-a = 0 is x = 2 / A
And 2 / A-1 = 2, so a = 6
Runway calculation formula C = 2 π R + 2L who can help me explain what these letters represent? How to calculate the formula
C=2πR+2L
R is the radius of the semicircle at both ends
L is the length of the run
C=πR+πR+L +L
=2πR+2L
C is the circumference
π is the circumference and R is the radius
L is the length of the heavy armour straight
Two semicircles and a courtyard together
The perimeter is 2 π R
The two straights are 2L
So the total is C = 2 π R + 2L
C is the circumference of the runway
π is a fixed value, about 3.14
R is the radius of the semicircle running to both sides
L is the length of the runway straight
Solve the following equation 3x squared - 1 = 2x
3x^2-1=2x
3x^2-2x-1=0
(3x+1)(x-1)=0
X = - 1 / 3 or x = 1
3x^2-2x-1=0
(3x + 1) (x-1) = 0 cross multiplication
x=-1/3 x=1
3x-2x-1 = 0
（3x＋1）（x－1）＝0
X1 = minus one third
X2 = one
30: x = 21.5:21, how much is x equal to
This is the proportion of the solution, according to the external product equal to the internal product
21.5X=30×21
21.5X=630
X=29.3
Warm cherry
If you don't understand,
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30 ：X=21.5:21
21.5X=21*30
X=21*30÷21.5
X=1260/43
x=21*30/21.5=29.3
How to solve the equation of 2x + 1 = 3x?
Junior three mathematics
2x²+1=3x
2x²-3x+1=0
(2x-1)(x-1)=0
X = 1 / 2 or x = 1
If the square of 2x - 3x + 1 = 0, then [2x-1] [X-1] = 0, so x = 1 / 2 or 1
Running a hotel with 80 suites, according to the survey, if we set the daily rent at 160 yuan, we will be able to fill up the hotel. For every 20 yuan increase in the rent, we will lose three guests. The daily service and maintenance expenses of each guest room are 40 yuan. Q: how much should we set the price to make the most money?
I don't know how to ask the master to move!
Let's say that when the price rises by 20 yuan, the profit y is the highest
When x = 0, y = 160 * 80-40 * 80
The countable equation is as follows
y=(160+20x)*(80-3x)-40*(80-3x)
The results are as follows
y=20*(-3*x*x+62*x+480)
When x = 62 / 6, there is a maximum
When x = 10, the maximum value is obtained by rounding
So the price is 160 + 20 * 10 = 360
If the solution of the equation 2x2 + 3x-m = 0 about X is x = - 1, then M=______ .
Substituting x = - 1 into the equation: 2-3-m = 0, the solution: M = - 1. So the answer is: - 1