A meteorological group measured the temperature of 18 degrees, 20 degrees, 28 degrees and 26 degrees respectively at 2:00, 8:00, 16:00 and 20:00 in a day, and calculated the average temperature of the day

(18 + 20 + 28 + 26) △ 4, = 92 △ 4, = 23 ℃. A: the average temperature on this day is 23 ℃

The weather team measured the temperature at 3:00, 8:00, 14:00 and 20:00 in a day, and found that the temperature was 5 ℃, 9 ℃, 20 ℃ and 18 ℃ respectively, and calculated the average temperature of the day,

The average temperature of a day is the average value of the maximum and minimum temperature of the day, not the average value of the temperature recorded at each observation time. Without the maximum and minimum temperature, the average temperature of the day can not be calculated, but can only be estimated

If the sum of the first four items is 40, the sum of the last four items is 80, and the sum of all items is 210, then the number of items in this sequence is______ ．

The sum of the first four items is a1 + A2 + a3 + A4 = 40 (1), and the sum of the last four items is an + an-1 + An-2 + an-3 = 80 (2). According to the nature of the arithmetic sequence (1 + 2), we can get: 4 (A1 + an) = 120 {(a1 + an) = 30 (1 + an) = 30 (1). From the sum of the first n items of the arithmetic sequence, we can get: SN = n (a1 + an) 2 = & nbsp; 15N = 210, so n =

Heine's theorem proves that the limit of sin radical X does not exist when limx approaches positive infinity

Let x (n) = (2n π - π / 2) ^ 2, y (n) = (2n π) ^ 2, have LIM (n → inf.) x (n) = + inf., LIM (n → inf.) y (n) = + inf., but the limits of sequence {sin √ (x (n))} and {sin √ (Y (n))} exist but are not equal

What is the expression of power

P=W/t

The sentence describing the scenery of the Three Gorges in summer in the Three Gorges

The sentence in Three Gorges describes the scenery of Three Gorges in summer

On the proof of Taylor formula!
P (x) = A0 + A1 (x-x0) + A2 (x-x0) ^ 2 +... + an (x-x0) ^ n (where 0, 1 and 2 are lower subscripts) how much is the derivative of this function formula? {suppose that this formula has up to (n + 1) derivative in the open interval containing x0!}
If P (x0) is derived, is it not equivalent to A0? This is the content in the fourth edition of the first volume of advanced mathematics, which is on page 173. It's how to work out A0, A1, A2... I'm self-taught. No one around me can ask. Who can help me!

The derivation of P (x0) is 0, because P (x0) is a constant, and the constant is 0, that is [P (x0)] '= 0, and P' (x0) represents the derivative value of P (x) at x0. First, we need to derive P (x), and then substitute the value of x0 into p '(x) = a1 + 2 * A2 (x-x0) +... + n * an (x-x0) ^ (n - 1), and substitute x0 into p' (x0) = A1, so p '(x0) and [P

In the school chorus, girls account for three fifths of the total. Now 10 boys are replaced by 10 girls. At this time, girls account for seven fifths of the total. How many girls are there in the original chorus

10 / (3 / 5-7 / 15) = 75 students (total number of students)
75 * (3 / 5) = 45
A: there were 45 girls

How much is 12 out of 19 times 26
Using simple algorithm

19 and 12 out of 13 = 259 out of 13, then multiply by 26, approximately = 259 times 2 = 518

Finding the general term formula of sequence 0, - 1,1,0 and sequence-1,0,0,1

- (n-4) (n-1) (2 n-5)/2
(n-3) (n-2) (2 n-5)/6

A meteorological group measured the temperature of 18 degrees, 20 degrees, 28 degrees and 26 degrees respectively at 2:00, 8:00, 16:00 and 20:00 in a day, and calculated the average temperature of the day