1+2+3+4+.+1999+2000+2001

Add 1 and 2000 together. 2 and 1999, and you get 1000 2001
So the original test = 2001 × 1000 + 2001 = 2003001

It is known that (| m | - 1) x 2 - (m-1) x + 8 = 0 is a linear equation of one variable with respect to X

According to the meaning of the question, | m | - 1 = 0 and M-1 ≠ 0, the solution is m = 1 or M = - 1 and m ≠ 1, | M = - 1

It is known that (| m | - 1) x 2 - (m-1) x + 8 = 0 is a linear equation of one variable with respect to X

According to the meaning of the question, | m | - 1 = 0 and M-1 ≠ 0, the solution is m = 1 or M = - 1 and m ≠ 1, | M = - 1

It is known that the square of M of (m-1) X-13 = 5 is a one variable linear equation about X, and the value of M is obtained

From the meaning of the title
m-1≠0 ,m^2=1
So m = - 1
I'm glad to answer for you. I hope it can help you,

There are 2 / 3 people in front of Xiaohua and 1 / 4 people in the back. How many people are there in this group
Don't solve equations

2 / 3 + 1 / 4 = 11 / 12, so there are 12 people, 12 * 2 / 3 = 8 people in the front and 12 * 1 / 4 = 3 people in the back

What is the perimeter formula of parallelogram

2(a+b)
a. B is the length of two adjacent sides

tanx+tany=25,cotx+coty=30.tan(x+y)=?
RT

cotx+coty
=1/tanx+1/tany
=(tanx+tany)/(tnaxtany)
That is 30 = 25 / (tanxtany), so tanxtnay = 5 / 6
tan(x+y)
=(tanx+tany)/(1-tanxtany)
=25/(1-5/6)
=150

English translation
1.which of the following is equivalant to the equation x^2+5x+y^2-1=0 in polar form?
2.if A is a 23matrix ,and B is 34matrix,then the product of A times 3B is a matrix of which of the flolling dimensions?

1. Which of the following (numbers) satisfies the equation x ^ 2 + 5x + y ^ 2-1 in polar form?
2. If a is a 2 * 3 matrix and B is a 3 * 4 matrix, which of the following is the dimension of the matrix obtained by multiplying a by 3B?

Help me solve some mathematical geometry problems
1. If the sum of the volumes of the two spheres is 12 π and the sum of the circumference of their great circle is 6 π, then the difference between the radii of the two spheres is ()
2. If the height of the circumscribed cone of a ball is three times the radius of the ball, the ratio of the side area of the cone to the area of the ball is ()
3. If the height of the cuboid is equal to h, the bottom area is equal to a, and the cross-sectional area passing through the opposite side edge is equal to B, then the side area of the cuboid is equal to ()
4. If the axis section is a square cylinder and the axis section area is s, then its total area is ()
5. If the bottom diameter and height of a cone are equal to the diameter of the same ball, the volume ratio of the cone to the ball ()
6. The distance from the center of the inscribed sphere of a regular tetrahedron to a plane is equal to the height of the regular tetrahedron ()
Thank you first
Good answer points

1. Let the radius of the small ball be r and the radius of the large ball be r
4/3*πR3 +4/3*πr3 =12π,
2πr+2πR=6π
The equation approximately equals R3 + R3 = 9, R + r = 3. The result is r = 2, r = 1, so the difference is 1
2. I've worked too long to forget the formula of sphere area, but the radius of cone bottom is three times the root of sphere radius. It's hard to describe the process because it needs drawing. Let's set up our own formula to calculate the rest
3. Don't understand which side the side edge refers to
4. The height of cylinder is radical s, and the radius of circle is 1 / 2 * radical s, so the total area is 2 * (π * s / 4) + 2 π * radical s / 2 * radical 2 = 3 / 2 π s

Compare the square of a plus the square of B with the size of AB + A + B + 1

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1+2+3+4+.+1999+2000+2001