Square of x-2x-4y + 1

Square of x-2x-4y + 1

Equal to (x-1) square - 4Y square = (x-1 + 2Y) (x-1-2y)

The derivative of y = (1 + x) ^ x ^ 2 is the square power of X of 1 + X

lny = x²ln(1+x)
y'/y = 2xln(1+x) +x²/(1+x)
y' = [2xln(1+x) +x²/(1+x)]y = [2xln(1+x) +x²/(1+x)](1+x)^x²
= 2x(1+x)^x^2*ln(1+x) + x²(1+x)^(x²-1)

How to find the first derivative of the square power of negative half X of E?

It is equivalent to u = (- 1 / 2) x ^ 2 on y = e ^ u composition
{e^[(-1/2)*x^2] }'=e^[(-1/2)*x^2] * [(-1/2)*x^2]'
=-x * e^[(-1/2)*x^2]

From city a to city B, it's 15 o'clock for car a, from city B to city a, and it's 10 o'clock for car B. the two cars leave from both places at the same time. After a few hours' meeting, car a runs all the way

Speed of car a: 1 / 15 = 1 / 15
Speed of car B: 1 / 10 = 1 / 10
Combined speed: 1 / 15 + 1 / 10 = 1 / 6
Meeting time: 1 △ 1 / 6 = 6 (hours)
When they met, car a traveled the whole journey: 1 / 15 × 6 = 2 / 5 = 40%

If a rational number AB satisfies A-3 + B + 2 = 0, find the opposite number of a + B

A-3 + B + 2 = 0
So A-3 = 0, B + 2 = 0
a=3,b=-2
a+b=3-2=1
therefore
The opposite number of a + B is - 1

Who knows the information of Shenzhou?

Shenzhou spacecraft
Shenzhou spacecraft is a kind of satellite spacecraft developed by China. The spacecraft is composed of propulsion module, return module, orbital module and additional section, with a total length of 8.86 meters and a total weight of 7790 kg. Shenzhou rocket was launched into low orbit by long march 2F rocket
structure
Propulsion module
The propulsion module of the spaceship is located in the rear of the spaceship. It is cylindrical in shape, equipped with four main engines and translation engines, and more than 20 square meters of main solar array on both sides. The propulsion module is mainly used for attitude control, orbit change and braking of the spaceship
Return capsule
The return capsule of the spacecraft is located in the middle of the spacecraft. Its shape is a large blunt inverted cone, with a diameter of 2.5 meters and a space of about 6 cubic meters. It can accommodate three astronauts. It is the largest spacecraft in the world. The shape of the return capsule of the spacecraft is designed according to part of the lift body, and the spacecraft adopts the lift reentry mode. The spacecraft adopts the dome parachute recovery scheme, with a parachute area of 1200 square meters, It's the biggest parachute in the world
Orbital module
The orbital module of the spaceship is located in the front end of the spaceship, which is a cylindrical shape with cone angles at both ends, and is equipped with [solar cell]] array, solar sensor, antenna and docking mechanism on both sides. The orbital module is the life module, test module and cargo module of astronauts during orbital flight, It can continue to work in orbit for more than half a year. The orbital module launched last time can rendezvous and dock with the next spacecraft, which saves the launch times of rendezvous and docking and reduces the overall cost of manned space program. The additional segment of spacecraft is mainly used for rendezvous and docking, and it is generally decided whether additional segment is needed according to the mission content
Task performed
So far, China has launched six series of spaceships from shenzhou-1 to Shenzhou-6, among which Shenzhou-5 and Shenzhou-6 are actually manned
-[shenzhou-1 (November 20, 1999) - the first test flight, successfully realized the round trip between heaven and earth
-Shenzhou-2 (January 9, 2001) - the first prototype unmanned spacecraft. The main purpose of the flight test is to examine the whole process of the whole project and each system from launch to operation, return and orbit retention, check the correctness and matching of the overall technical scheme and each system technical scheme, and obtain data related to manned flight and scientific experiment data
-Shenzhou-3 (March 25, 2002) - the main purpose of the flight test is to assess the escape function of the rocket, redundancy of the control system, emergency rescue of the spacecraft, autonomous emergency return, manual control and other functions
-Shenzhou-4 (December 29, 2002) - a flight test under unmanned condition. The main purpose of the flight test is to further improve and assess the reliability of rocket, spacecraft and TT & C system in order to ensure the absolute safety of astronauts
-Shenzhou V (October 15, 2003) - the first successful manned flight, carrying astronaut Yang Liwei to orbit the earth 14 times
-Shenzhou-6 (October 12, 2005) - the first multi person and multi day space flight, carrying astronauts Fei Junlong and Nie Haisheng
Planned tasks
-Shenzhou-7 (2008)
-Shenzhou 8
reference

3.5 times of x minus 9.6 equals 2.3 times of X. find X. solve the equation

3.5x-9.6=2.3x
Transfer: 3.5x-2.3x = 9.6
1.2x=9.6
x=9.6÷1.2
x=8

About car turning, centripetal force
Who provides the centripetal force?
Can the stress analysis be given?
I understand that,
In the process of driving in a straight line at a constant speed, the car is subject to backward sliding friction and forward power (the resultant force is 0). When the car turns, the driving direction of the car is not in a straight line with the direction of sliding friction, so an external force, that is, centripetal force, is generated, and it is inclined to the direction of the car turning

Yes, but more accurately, the centripetal force of a car when turning is provided by the resultant force of all the external forces acting on it. For example, the reaction force of the car support caused by the inclination of the road surface can also be combined with gravity, driving force and friction resistance to form a centripetal force

2x-1 / 3-5x-4 / 6 less than or equal to 1

2x-1 / 3-6 / 5x-4 ≤ 1 multiply by 6
2（2x-1）-(5x-4)≤6
4x-2-5x+4≤6
-x+2≤6
x≥2-6
x≥-4
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Both a and B set out from a to B. A walked 5km before B set out. A's speed was 4km / h, B's speed was 5km/
If a and B are x kilometers apart, what is the time for a to walk_ Hours. What's the time for B to leave_ hour

The time for a to leave is x / 4 hours, and the time for B to leave is x / 5 hours