Let the sum of the first n terms of the sequence {an} be Sn, let TN = S1 + S2 + +SNN is called sequence A1, A2 The "ideal number" of, an, the known sequence A1, A2 , the "ideal number" of a 500 is 2004, then the sequence 2, A1, A2 The ideal number of a 500 is______ ．

Let the sum of the first n terms of the sequence {an} be Sn, let TN = S1 + S2 + +SNN is called sequence A1, A2 The "ideal number" of, an, the known sequence A1, A2 , the "ideal number" of a 500 is 2004, then the sequence 2, A1, A2 The ideal number of a 500 is______ ．

According to the meaning of the title, the sequence A1, A2 The ideal number of a 500 is S1 + S2 + +S500500 = 2004, that is S1 + S2 + +S500 = 2004 × 500; sequence 2, A1, A2 The ideal number of a 500 is: 2 + (S1 + 2) + (S2 + 2) & nbsp; + +(s500+2)501=2×501+(s1+ s2+… +&nb...

The perimeter of the square in the figure is 36dm. Can you work out the area of the parallelogram?

The perimeter of the square is 36dm, so the perimeter of the square is: 36 △ 4 = 9 (decimeter), and the area is: 9 × 9 = 81 (square decimeter). Because the square and the parallelogram have the same base and height, the area of the square is equal to the area of the parallelogram, that is, the area of the parallelogram is 81 square decimeter. A: the area of the parallelogram is 81 square decimeter

53 and 1 / 3 △ 1 and 2 / 3-42 and 2 / 3 × 3 / 5 + 4 and 1 / 3 × 0.6
The best calculation!

53 and 1 / 3 △ 1 and 2 / 3-42 and 2 / 3 × 3 / 5 + 4 and 1 / 3 × 0.6
=53 and 1 / 3 × 3 / 5-42 and 2 / 3 × 3 / 5 + 4 and 1 / 3 × 3 / 5
=(53 1 / 3-42 2 / 3 + 4 1 / 3) × 3 / 5
=15×3/5
=9

It is known that a set of data x1, X2 The average of XN is 10 and the variance is 2 The average of XN + 3 is__________ The variance is_________ Data 2x1, 2x2 The average of, 2xn is__________ The variance is____________ (3) data 2x1 + 3, 2x2 + 3 The average of 2xn + 3 is_________ The variance is_________

Known, a set of data x1, X2 The average of XN is 10 and the variance is 2 The average of XN + 3 is___ 13_______ The variance is____ 2_____ Data 2x1, 2x2 The average of, 2xn is______ 20____ The variance is______ 8______ (3) data 2x1 + 3, 2x2 + 3 ,...

The area of kitchen ground is 6 meters 2, the floor tile that shop length 3 decimeters, width 2 decimeters, need how many pieces?

3 decimeter = 0.3 meter, 2 decimeter = 0.2 meter, 6 △ 0.3 × 0.2 = 6 △ 0.06 = 100 pieces

How to determine the direction of current and voltage in Kirchhoff's voltage law

Voltage direction, this statement is really "new"
Let me tell you to determine the current direction first. The so-called voltage "direction" can be determined
First, the current of each branch is set at the node, and the direction is set arbitrarily. Then, according to the set direction equation, if the current is positive, it will be the same as the set direction, otherwise it will be negative, it will be opposite
When you want to use Kirchhoff's law to solve the circuit, the circuit is generally more complex, it is impossible to easily analyze the direction of the current, and the above is the general method!

The definition field of function y = lnx-1 is?

With five 12 cm, 8 cm wide rectangles, put it together into a square, how to put it together, and what is the perimeter of the square after putting it together

The length is 12 × 2 = 24 cm
The width is 8 × 3 = 24 cm
The circumference is 24 × 4 = 96 cm
Vertical 3 horizontal 2

(2.50.250.025) * 4 what is the convenient method to use

(2.5 0.25 0.025)*4
2.5*4=10
0.25*4=1
0.025*4=0.1

To get the image of the function y = 2cos (x + π / 6) sin (π / 3-x) - 1, we only need to translate the function y = 1 / 2sin2x + √ 3 / 2cos2x several units

The function y = 2cos (x + π / 6) sin (π / 3-x) - 1 = 2cos (x + π / 6) sin [(π / 2 - ((x + π / 6))] - 1 = 2cos (x + π / 6) cos (x + π / 6) - 1 = 2cos & # 178; (x + π / 6) - 1 = cos (2x + π / 3), y = 1 / 2sin2x + √ 3 / 2cos2x = sin (2x + π / 3) = cos (π / 2-2x - π / 3) = cos (2x - π / 6) = Co