Ask a problem of linear equation of one variable! If the order of three or three digits is reversed, the sum of the three digits is 1771

Ask a problem of linear equation of one variable! If the order of three or three digits is reversed, the sum of the three digits is 1771

Let X be the number of tens, then x + 1 is the number of hundreds, and 3x-2 is the number of members
100(x+1）+10x+3x-2+100(3x-2)+10x+x+1=1171
The solution is x = 3,
four hundred and thirty-seven

A mathematical problem requires solving with a linear equation of one variable,
In the calendar shown in the figure, xiao gang finds that the sum of the four dates of his birthday is just 48, so what's the date of his birthday?
One two three four five six
1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30
Please list the equivalent relation first (although it's very troublesome, but I don't know. It's better to list it. If you can't, you don't need it.)
Remember! The equation of first degree with one variable!
OK, I will add it!

If you can understand it this way, because the title mentioned four dates, then it means that there are four numbers up, down, left and right
According to the meaning of the title, we can set the date of birthday as X, then its top, bottom, left and right dates are respectively X-7, x + 7, X-1, x + 1. The four numbers add up to 4x = 48, so the birthday is the 12th!

Two equation problems (one of them needs to be unknown)
A building is 29.2 meters high. The first floor is ready to open a shop. The first floor is four meters high. The top nine floors are residential buildings. How many meters are there on each floor
Question 2: when a is equal to how much, the result of the following formula is 0? When a is equal to how much, the result is 1: (36-4a) △ 8, and then type the formula of how to write the second question

1.
The height of each floor is x meters
4 + 9x = 29.2 x, you can calculate by yourself
two
1) When a = 9, the result is 0; in this case, let (36-4a) * 8 = 0
2) When a = 287 / 32, the result is 1; in this case, (36-4a) * 8 = 1 can be obtained

What is the fastest speed of a spaceship in the universe?

With the progress of science, the speed of spaceship is increasing. However, no matter how to improve it, there will be a limit speed, that is the speed of light. The speed of any object will not exceed the speed of light, so the speed of spaceship reaching the speed of light 3x10 ^ 8 m / s is the limit

If x ^ 2-9x + 18 = 0, then x ^ 2 + 1 / x ^ 2 equals?

x²-9x+1=0
x²+1=9x
Divide both sides by X
x+1/x=9
Square on both sides
x²+2+1/x²=81
x²+1/x²=79

How many types of drum wheel brakes are there? What do they have?

Is it the shoe form inside?
Double leading hoof, double follower hoof, leading follower hoof~
The brake shoe on the side of self increasing force is called leading shoe, and the brake shoe on the side of self reducing force is called slave shoe. The friction torque of leading shoe is 2-2.5 times of that of slave shoe

When m is a value, the solution of the equation 3x + 2m / 3 = x + m / 2 + 1 is 2 times larger than that of the equation 2 (3x + m) - 3 = 4 (x + m)

Let's work it out
So the solution 3x + 2m / 3 = x + m / 2 + 1
The solution is x = 1 / 2-m / 12
Solving equation 2 (3x + m) - 3 = 4 (x + m)
The solution is x = m + 3 / 2
Moreover, the solution of the equation 3x + 2m / 3 = x + m / 2 + 1 of X is 2 times larger than that of the equation 2 (3x + m) - 3 = 4 (x + m) of X
namely
（1/2-m/12）-（m+3/2）=2
So we can get the solution
m=-36/13

The distance between a and B is 80 kilometers. A person from a to B, the first hour is 1 / 4 of the whole journey, the second hour is 3 / 4 of the first hour, how many kilometers is he from a?

At this time, he is 80x (1 / 4 + 1 / 4x3 / 4) = 35 (km) away from Jiadi

Given the set a = {1,2, a ^ 2 + A-2}, B = {2,4, a}, a intersects B = {2.4}, find the value of A

A = - 3, ∩ a ∩ B = {2,4}, ∩ a ^ 2 + A-2 = 4, ∩ a = - 3 or 2, and∩ a = 2 are repeated in set B, ∩ rounded off, ∩ a = - 3

How to factorize (x2 + 8x + 16) - 16y2

(x2+8x+16)-16y2
=(x+4)^2-(4y)^2
=(x+4+4y)(x+4-4y)