What do the letters in the third-order Rubik's cube formula represent Better have English meaning, OK?

What do the letters in the third-order Rubik's cube formula represent Better have English meaning, OK?

F = front
B = back
R = right
L = left
U = up (above)
D = down (below)
90 degrees clockwise = for letters
90 degrees counter clockwise = represents the letter "+"
180 degrees clockwise = represents letter + 2
180 degrees counter clockwise = represents the letter ＋ "'2"
Turn 90 degrees clockwise (i.e. once)
D turn the bottom layer 90 degrees clockwise
Turn the middle layer of e clockwise 90 degrees (i.e. once)
X the whole cube makes a 90 degree turn in the R direction
Turn 90 degrees counter clockwise at the top of U '
D 'turn the bottom 90 degrees counter clockwise (i.e. once)
Turn 90 degrees counter clockwise in the middle of E '
X 'the cube turns 90 degrees in the R' direction
Turn the upper layer of U2 clockwise 180 degrees to counter clockwise 180 degrees, the actual result is the same as clockwise!
D2: turn clockwise 180 degrees to counter clockwise 180 degrees, the actual result is the same as clockwise!
Turn clockwise 180 degrees to counter clockwise 180 degrees, the actual result is the same as clockwise!
X2 the whole Rubik's cube turns 180 degrees in the R direction
R turn 90 degrees clockwise on the right side
L turn 90 degrees clockwise on the left side
Turn the middle layer of M clockwise 90 degrees (i.e. once)
Y the whole cube makes a U direction 90 degree turn
Turn 90 degrees counter clockwise on the right side of R '
Turn L 'left 90 degrees counter clockwise
Turn 90 degrees counter clockwise in the middle of M '
Y 'the whole cube turns 90 degrees in the U' direction
Turn the right side of R2 clockwise 180 degrees to counter clockwise 180 degrees, the actual result is the same as clockwise!
Turn the left side of L2 clockwise 180 degrees to counter clockwise 180 degrees, the actual result is the same as clockwise!
In M2, turn clockwise 180 degrees to counter clockwise 180 degrees, the actual result is the same as clockwise!
Y2 the cube turns 180 degrees in the U 'direction
Make a 90 degree clockwise turn in front of F
Make a 90 degree clockwise turn after B
S (turn clockwise 90 degrees to f)
Z make a 90 degree turn in the f direction
Turn 90 degrees counter clockwise in front of F '
Turn 90 degrees counter clockwise after B '
Turn 90 degrees counter clockwise in the middle of s'
Z 'the cube turns 90 degrees in the f' direction
In front of F2, turn clockwise 180 degrees to counter clockwise 180 degrees, the actual result is the same as clockwise!
After B2, turn clockwise 180 degrees to counter clockwise 180 degrees, the actual result is the same as clockwise!
Turn the middle layer of S2 'clockwise 180 degrees to counter clockwise 180 degrees, the actual result is the same as clockwise!
Z2 the whole Rubik's cube turns 180 degrees in the f direction

What is 3 / 5-0.875 + 0.4 + 2 and 7 / 8?

3 / 5-0.875 + 0.4 + 2 and 7 / 8
=（3/5+2/5）+(7/8-7/8)
=1+0
=1
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The perimeter of a square is 48 meters. How many square meters is the area

The side length is 48 △ 4 = 12M, so the area is 12x12 = 144m2

What is the difference between DC motor and AC motor? What is their concept?
But is AC motor related to commutator?

The function of motor is to convert electric energy into mechanical energy. Motor is divided into AC motor and DC motor. (1) AC motor and its control. AC motor is divided into asynchronous motor and synchronous motor. Asynchronous motor is divided into single asynchronous motor, two-phase asynchronous motor according to the different number of stator phases

3x+3=9x-5

3x+3=9x-5
3+5=9x-3x
8=6x
X = 4 / 3

The perimeter of a parallelogram is 110cm, the height of one parallelogram is 10cm, and the height of the other parallelogram is 12cm-

Let one side of a parallelogram be x and the other be y
Then: 2x + 2Y = 110, we get: x + y = 55
If the diagonal BD is connected, the area of the triangle abd is equal to the area of the triangle BCD
The result is: 10x = 12Y
The solution of the two equations is: x = 30, y = 25
So: the area of parallelogram s = 30 * 10 / 2 + 12 * 25 / 2 = 300

Time = distance ／ speed distance = time × speed speed = time ／ distance
Please tell me which teacher, I just want to ask, ha ha

In physics, speed is a physical quantity with size and direction. Strictly speaking, none of the above is correct

General solution of differential equation y '' - 4Y '+ 4Y = 2x-1

Idea: first find the general solution of the homogeneous equation y "- 4Y '+ 4Y = 0: the characteristic equation is R (2) - 4R + 4 = 0, and the solution is r = 2, that is, the general solution is y = C * e (2x) (the bracket is the exponent)
Let the general solution of the original differential equation be y = u * e (2x), and substitute it into the original formula to find out the general solution of u, and then substitute it into the assumed general solution, which is the general solution of the original equation

A cone's side view is a fan. The area of the fan is 1.57 square centimeter, and the bottom radius is 1 centimeter. What's its surface area?

What is the base area of the cone
1 × 1 × 3.14 = 3.14 (square centimeter)
What is the surface area of a cone
3.14 + 1.57 = 4.71 (cm2)

How to write 4 3 / 4 △ 1 3 / 16? Calculate and check!

19/4÷19/16=19/4×16/19=4