2.4X5+7x=19

2.4X5+7x=19

2.4X5+7x=19
12+7x=19
7x=19-12
7x=7
X=1
2.4X5+7x=19
7x=19- 2.4X5
X=1
2.4X5+7x=19
7x=19－12
7x=7
X=1
How to solve the equation with 30 - 3x = 19.2
30 - 3X = 19.2
30 -19.2 = 3X
3x=10.8
x=3.6
How to solve the equation: 3x-4x5 = 16?
3X-20=16
3x=16+20
3x=36
x=12
4X + x = 0.25 (solving equation)
The original equation is equivalent to 5x = 0.25 x = 0.05
5x=0.25
x=0.05
5x=0.25
x=0.05
x=0.05
x=0.05
5x=0.25 x=0.05
4x+x=0.25
5x=0.25
x=0.25/5
x=0.05
4X+X=0.25
5X=0.25
X=0.05
X=0.5
5X=0.25
X=0.25/5
X=0.5
Average velocity formula
What does it mean if it's not s / T? What's the difference between the velocity obtained by the ratio of displacement to time
Velocity definition: v = x / T
There are two cases
(1) V (average) = x / T (the time of T is arbitrary) --- the average speed of motion in a period of time
(2) Instantaneous velocity v = x / T (t is very small) ---- indicates the speed of movement at a certain time
Speed has no direction, speed has direction, and speed refers to instantaneous speed. The limit of average speed is instantaneous speed. The formula for speed is distance divided by time. In fact, the value of velocity is the same, but the concept is different
54 + 4x = 75 + X what is x equal to?
Using equation
54+4X=75+X
4x-x = 75-54
3x=21
X=7
Potato group Shao Wenchao answers questions for you
If you don't understand this question, you can ask,
Seven
54+4X=75+X
∴3X=21
∴X=7
54+4X=75+X
4X-X=75-54
3X=21
X=7
This is my conclusion after meditation,
If I can help you, I hope you will give me a satisfactory answer
If not, please ask, I will try my best to help you solve it~
The answer is not easy. If you are not satisfied, please understand~
50 people attended the party. The first girl shook hands with all the boys, the second girl only missed one boy, the third girl only missed two boys, and so on. The last girl shook hands with seven boys. How many boys are there?
28 boys
If there are x girls, then
X+（X-1）+7=50
So x is 22 and the number of boys is 28
Calculation: X * x + 4x = 2, how much is x equal to
x²+4x=2
x²+4x+4=6
(x+2)²=6
x+2=±√6
x1=√6-2, x2=-√6-2
x²+4x+4=2+4
(x+2)²=6
x=±√6-2
Formula, add 4 on both sides, get
(x+4)²=8
x=-4±2√2
At a meeting, every two people who attended the meeting shook hands with each other once. According to statistics, they shook hands 66 times. How many people attended the meeting?
Set the number of people to X
X(X-1)/2=66
Why divide by two?
Set X people to the meeting
Each person shakes hands separately with (x-1) other than himself
Because a and B shake hands and B and a shake hands only once
So divide by two
I.e. x (x-1) / 2 = 66
Get x = 12 or x = - 11 (rounding off)
12 people attended the meeting
66 + 1.
Each person holds it once. 66 times, 66 people add themselves to 67 ~ is there any other secret?
Here's a rough idea~
Divided by two, because each handshake is two people.
In fact, this question is very simple, 66 * 2 = 132132 = 12 * 11, so there are 12 people. Each person shakes hands 11 times, so a total of 132 / 2 = 66 times. The same is true for solving your equation, but there is one solution that doesn't fit the meaning of the problem.
Set the number of people to X
X(X-1)/2=66
Do it by yourself!!!!!
Calculation: x ^ 2-9 / 4-x ^ 2 * x ^ 2 + X-2 / x ^ 2-4x + 3,
(x^2-9)/(4-x^2) * (x^2+x-2)/(x^2-4x+3)
=(x-3)(x+3)/(2-x)(2+x) * (x+2)(x-1)/[(x-1)(x-3)]
=(x+3)/(2-x)