Calculation: x ^ - 4 / (X-2) (x-1) + x ^ - 4 / (x + 2) (x + 1)

Calculation: x ^ - 4 / (X-2) (x-1) + x ^ - 4 / (x + 2) (x + 1)

Original formula = (x + 2) (X-2) / (X-2) (x-1) + (x + 2) (X-2) / (x + 2) (x + 1)
=(x+2)/(x-1)+(x-2)/(x+1)
=(x²+3x+2+x²-3x+2)/(x+1)(x-1)
=(2x²+4)/(x²-1)

Calculation: (2 + 1) (2 ^ 2 + 1) (2 ^ 4 + 1) x.x (2 ^ 1006 + 1)

（2+1)（2^2+1)(2^4+1)x.x(2^1006+1) =1*（2+1)（2^2+1)(2^4+1)x.x(2^1006+1) =(2-1)（2+1)（2^2+1)(2^4+1)x.x(2^1006+1) =(2^2-1)（2^2+1)(2^4+1)x.x(2^1006+1) =(2^4-1)(2^4+1)x.x(2^1006+1) =(2^8-1)x.x(2^1006+1...

On the horizontal ground, the elevation angle of the top C of the flagpole BC measured by point a is 60 degrees, and the distance AB from point a to the flagpole is 10, then the length of the flagpole BC is 60 degrees_____ rice

tan 60° = BC：AB
BC=ABtan60°
=10√3m

Primary school first grade technology small invention small production, please have ah

I am a fourth grade pupil, but I have a small invention, very simple: go to the store to buy a birthday card (which can shine and sing), and then take a box that can put down the birthday card, stick one side of the birthday card on one side of the box, and make a security music box. As soon as the thief opens the box, he will think

If the value of fraction x2 − 5x + 6x − 2 is zero, then x=______ ．

From the meaning of the question: x2-5x + 6 = 0, X-2 ≠ 0, the solution: x = 3

The campus of Huayuan primary school is 120 meters long and 50 meters wide. On the plan, the width and length of the campus are represented by 10 cm line segments

120:50 = length: 10
Length = 24 cm

The story about mathematicians is less than 50 words

The story of Hua Luogeng in 1946, Hua Luogeng was invited to give a lecture in the United States, and was employed as a tenured professor by the University of Illinois. His family also came to live in the United States, with foreign houses and cars. At that time, many people thought that Hua Luogeng would not come back

Known cloth total weight is 51.25kg, 1 square = 1.88m, 1 square = 0.246kg, cloth width is 0.532m, how to calculate the total length of cloth!

51.25/0.246 = 208.33 M2
208.33 * 1.88 = 391.67m

The bottom of an isosceles trapezoid is twice as big as the top. Divide it into four trapezoids with the same area and shape. Please have a try

According to the analysis, the drawing is as follows:

Using the distance between the two sides of the symmetry axis and the two overlapped points to the symmetry axis (), the () figure of a figure can be drawn

By using the distance (equal) between the two sides of the symmetry axis and the two overlapped points of a symmetry figure, the (symmetrical) figure of a figure can be drawn