If the solution of the equation 1 + 2-x of x = x-4 = 2m is also a solution of the inequality system, can you find the value range of M?

If the solution of the equation 1 + 2-x of x = x-4 = 2m is also a solution of the inequality system, can you find the value range of M?

If you describe the equation clearly, is it 1 x / (2-x) = x-4 = 2m?

If the equation (a + 1) x square + (2a-5) x + A-1 = 0 has two real roots, find the value range of A
RT, speed

(a + 1) x square + (2a-5) x + A-1 = 0 has two real roots
Then a + 1 ≠ 0 is needed
And Δ = (2a-5) ^ 2-4 (a + 1) (A-1) ≥ 0
4a^2-20a+25-4a^2+4≥0
∴-20a+29≥0
The solution is a ≤ 29 / 20
∴
The range of a is a ≤ 29 / 20 and a ≠ - 1

The order of mixed integer operations is____________

If there are brackets, calculate them first. The brackets also follow the principle of square first, then multiplication and division, and then addition and subtraction

The tube is bent into a circle, and there is a small ball with mass of m in the tube to do circular motion. When the ball moves to the highest point, the tube just leaves the ground, and the speed of the ball at this time is high
The inner wall of the steel is smooth, the radius is r, and the mass of the pipe is 2m

If the force between the tube and the ball is equal to the gravity of the tube, which is 2mg, then the external force of the ball is 3mg, providing centripetal force
MV ^ 2 / R, v = root 3rg

In the arithmetic sequence {an}, given D = 12, an = 32, Sn = - 152, find A1 and n

In ∵ arithmetic sequence {an}, d = 12, an = 32, Sn = - 152, ∵ 32 = & nbsp; a1 + (n-1) × 12-152 = Na1 + n (n-1) 2 × 12, the solution is A1 = - 3, n = 10

If a car starts from a standstill and first makes a uniform acceleration linear motion with an acceleration of 1m / S2, the speed of the car at the end of 10s is m / s, and the displacement of the car passing through within 10s is m / s
Then the car runs at a constant speed for another 10 seconds, and the average speed of the car is m / s within the 20 seconds. Why 7.5m/s?

v=at=10*1=10m/s.
s=1/2at^2=1/2*1*10^2=50m
Average velocity = total displacement / total time
V average = (50 + 10 * 10) / 20 = 7.5m/s
A: the speed at the end of 10 seconds is 10 m / s. The displacement is 50 m, and the average speed is 7.5 M / s

Xiao Hong borrows a book from Xiao Li. She reads five pages a day, finishes half of the book in seven days, and then reads two pages a day. It's just at the end of the borrowing period. What's the borrowing period of this book?

5 × 7 = 35 (page)
35 △ 2 = 17 (days). 1 (page) ≈ 18 days
18 = 7 = 25 days
A: the book is available for 25 days

The winter in northern Europe is very cold. Compared with people living near the equator, what are the characteristics of the shape of the nose? Think about it. Why?

Northern Europe is located in cold regions, where the air is cold and dry. To adapt to this feature, its nose shape is thin and high, which can make the cold air have more time to be heated; while the equatorial region has a warm and humid climate, where people's nose is wide and flat, which is to absorb a large amount of warm and humid tropical air. These features are the result of long-term evolution It is large and long, adaptable to the environment and has the function of precooling

A point on the number axis that represents an integer is called an integral point. The unit length of a certain number axis is 1cm. If you draw a line ab of 2011cm randomly on this number axis
So the number of integral points covered by line AB is?
A2010 2011 B2009 2010 C2009 2011 D2010 2012

There is no right option
2011 or 2012
If point a is an integral point, 1cm line segments cover 2, 2cm line segments cover 3,..., 2011cm line segments cover 2012
If point a is not the whole point, 1cm line segment covers one, 2cm line segment covers two,..., 2011cm line segment covers 2011

A suit is 1200 yuan, of which the price of trousers is 3 / 5 of that of the coat. What's the price of this suit?

Top: 1200 ^ (1 + 3 / 5)
＝1200÷8/5
= 750 yuan
Pants: 750 × 3 / 5 = 450 yuan