English translation

Have you returned to the place where your ancestors lived, worked, studied and played? Qian Robert, a Chinese Canadian, has done it. Now in China, he has found his family, just like a fallen leaf
Robert is a young overseas Chinese who came to visit his ancestors' home as a member of the root seeking summer camp program. The program was organized by the local government of Guangdong Province. The program started in 1980. So far, it has brought thousands of overseas Chinese students to China to visit and find their roots. These young people are usually 16 to 25 years old, like Robert, who can't speak Chinese, And I have never been to China
Students mainly visit Guangdong Province in southern China. Outside the camp for two weeks, they study Chinese culture, see the changes taking place in this area, and visit interesting scenic spots. Going to their ancestral village is often the most exciting part of the trip. Students feel that they are a member here and experience rural life. They drink well water from the village, Went for a walk to the village and watched the villagers' daily activities
Cathy Qin, a young American student, said, "thanks for the root seeking program, I began to understand my Chinese roots and who I am. It's a great journey and I have so many wonderful memories in China."

English translation
How to Learn English Well
English is important and useful to us.How can we learn it well.Here are my suggestion.
First,we should often listen to the tapes,English songs and programs.Watching English movies is also helpful to us.Second ,we should speak English in class as much as possible.Don 't be afraid of making mistakes.The more you speak,the fewer mistakes you'll make.we 'd better join the English culb and practice with other.Third ,we can read more English newspapers and magazines.It 's good for us.At last,we should recite some good passages and keep diaries.In a word,as long as we do more listenling,reading and writing,we will learn English well.

How to learn English well
English is very important and useful to us. How can we learn it well? Here are some suggestions. First of all, we should often listen to tapes, English songs and programs. Watching English movies is also very helpful. Second, we should speak English as much as possible in class and don't be afraid of making mistakes, Third, we should read more English newspapers and magazines, which is very helpful. Finally, we should recite some good articles and keep a diary. In short, as long as we read more and write more, we will learn English well

Slip formula of induction motor

Slip is the ratio of speed difference (n0-n) to synchronous speed N0
S=(n0-n)/n0

The minimum value of the function y = - x ^ 2 + 4x + 2 in the interval [1,4] is_____ ?
A -7
B -4
C -2
D 2

Because the original function is a quadratic function with an opening downward
So when x is - B / 2A = - 4 / 2x (- 1) = 2, y has a maximum
So in the interval [1,4], the original function in [1,2] is an increasing function and in [2,4] is a decreasing function
When x is 1, y = - 1 ^ 2 + 4x1 + 2 = 6
When x is 4, y = - 4 ^ 2 + 4x4 + 2 = 2
So when x is 4, y has a minimum value of 2, and the answer is d

In a 30 cm long, 18 cm wide rectangular cardboard four corners each cut a side length of 3 cm square, fold it into a no cover rectangle
Body carton, how to cut the largest volume?
It's not 30cm long, it's 24cm wide, it's 12cm wide

It has been determined that volume: (24-2 × 3) (12-2 × 3) × 3 = 324 cubic centimeter. If the side length of the square on the four corners is not set as X, volume: v = (24-2x) (12-2x) * x = 4x ^ 3-72x ^ 2 + 288x, which is a cubic function of X. use the derivative method to find the maximum value. Let V '= 12x ^ 2-144x + 288 = 0, then x ^ 2-12x + 24 = 0 (x -...)

The following statement is correct ()
A. The greater the velocity V, the greater the distance S. B. the greater the velocity V, the greater the time T. C. the velocity V is directly proportional to the distance s and inversely proportional to the time T. D. the velocity V is determined by St, but has nothing to do with the size of S and t

In uniform linear motion, speed is a fixed value, that is, the ratio of distance to time is a fixed value, which has nothing to do with the distance the object passes and the time of motion

Solve the equation; 3x + 5x = 288

3x+5x=288
8x=288
x=288/8=36

Given that the center angle of a cone is 90 °, the ratio of the bottom radius of the cone to the length of the generatrix is 0______ ．

Let the generatrix length of the cone be r, then the arc length of the sector is 90 π R180 = π R2, and let the bottom radius be r, then π R2 = 2 π R  r = R4. The ratio of the bottom radius of the cone to the generatrix length is 1:4;

The known function f (x) = log (a) (x ^ 2-ax + 5), (a > 0, and a ≠ 0)
(1) when a = 2, find the minimum value of F (x);
(2) if it is meaningful for any x ∈ (0, + ∞) function f (x), find the value range of real number a

(1) when a = 2, the minimum value of F (x) = log (2) 4 = 2
(2) if f (x) is meaningful for any x ∈ (0, + ∞) function,
X ^ 2-ax + 5 > 0, a ^ 2-20

Inequality with absolute value in high school
It is known that the image of quadratic function f (x) = ax * x + BX + C passes through two points a (T1, Y1), B (T2, Y2), and satisfies a * a + (Y1 + Y2) a + y1y2 = 0
(1) Prove that Y1 = - A or y2 = - A
(2) It is proved that the image of function f (x) has two intersections with X axis
Please give me a complete answer+

1. The cross of A2 + a (Y1 + Y2) + y1y2 can be multiplied and transformed into: (a + Y1) (a + Y2) = 0. The solution is - a = Y1 or - a = Y22. F (x) - x = AX2 + (B-1) x + C, which is always greater than or equal to zero, so the opening is upward, a > 0. C is the coordinate of intersection with y axis, so it should be greater than or equal to 0

English translation