The square of a is equal to 2a, a can only be 4?

The square of a is equal to 2a, a can only be 4?

Wrong

Can you tell me the difference between the square of a and 2A?
1. Under what condition is the square of a less than 2A
2. Under what condition is the square of a = 2A
3. Under what circumstances is the square of a greater than 2A

1. At 0

If a denotes a number greater than 0, try to compare the sum of squares 2a of A. ① when a (), 2A = the square of a; ② when a (), 2A > the square of a; ③
If a denotes a number greater than 0, compare the sum of squares 2a of A
① When a (), 2A = the square of A
② When a (), 2A > the square of A
③ When a (), 2a is less than the square of A

If a denotes a number greater than 0, compare the sum of squares 2a of A
① When a (equal to 2), 2A = the square of A
② When a (less than 2), 2A > the square of A
③ When a is greater than 2, 2a is less than the square of A

The sum of squares of each deviation of a group of data is related to the data itself, but has nothing to do with the capacity of the data, right

It should be related to the sample size. If it is only the sum of squares, the larger the size is, the larger the sum of squares may be

Is a regression equation corresponding to a residual in Eviews software? How to get it?

After each regression, the value of the rest sequence will change. The value of the rest sequence after the regression is the corresponding residual of the regression equation. If you want to save it, you can create a new sequence and make its value equal to the value of the residual sequence

How to use Excel to calculate the residual sum of squares of polynomials?
Note that it's a polynomial. I want to know what function can be used to find the residual, the square of residual and the sum of residual squares of each term. If there is no function, is there any other method?

If it's me, I'll make a table
For example:
A B C D
Yi y ^ (yi-y ^) ^ 2 and
Do you understand?
Of course, a direct formula is also possible
=sumproduct(((b:b)-(a:a))*((b:b)-(a:a)))

How much is it from one to one hundred

1 + 2 + 3... + 100 = 5050 -------- remember the formula the fastest arithmetic sequence summation: n * (n + 1) / 2 = 100 * 101 / 2 = 5050 -------- or if you are familiar with the story of Gauss, just say 5050. After all, this is a very famous story in the history of mathematics

(1-1 / 2 square) (1-1 / 3 square) (1-1 / 4 square) * (1-1 / 99 square) (1-1 / 100 square) =?

(1-1 / 2 of the square) (1-1 / 3 of the square) (1-1 / 4 of the square) * *(square of 1-1 / 99) (square of 1-1 / 100) = (1 + 1 / 2) (1-1 / 2) (1 + 1 / 3) (1-1 / 3) (1 + 1 / 4) (1-1 / 4) * *(1+1/99)（1-1/99）(1+1/100)（1-1/100）=3/2x4/3x5/4x…… x100/9...

Given that the sum of the first n terms of a sequence is Sn = an & # 178; + BN (a, B belong to R) and S25 = 100, then A12 = a11 is?

An = SN-S (n-1) = an & # 178; + bn-a (n-1) & # 178; - B (n-1) = 2an-a + BA (n-1) = 2A (n-1) - A + ban-a (n-1) = 2an-a + b-2a (n-1) + A-B = 2A, which is the constant value. The sequence {an} is an arithmetic sequence with a + B as the first term and 2A as the tolerance. S25 = 25 (a + b) + 25 × 24 × 2A / 2 = 625a + 25B = 10025a + B = 4

It is known that {an} is an arithmetic sequence with tolerance D, BN = 1 / N (a1 + A2 +...) The sum of the first n terms of {an} and {BN} is Sn and TN respectively, if s25-t25

The title is not complete!
bn=1/n（a1+a2+...+an)
=1/n *(a1+an)n/2
=(a1+an)/2
=a1+(n-1)d/2
Let CN = an BN = (1-N) d / 2 = D / 2-nd / 2
S25-T25=c1+c2+...+c25
=25*d/2-(1+2+..+25)d/2
=-(1+2+...+24)d/2
=-150d∈（0,1）,
-1/150