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A column of numbers 1, 2, 3, 4, 7, 11, 16, 22, 29. What is the number from the left of this column divided by 5?
The law of this sequence starts from 4,7, and the difference between every two numbers is 3,4,5,6
Because 4 is the fourth number in the sequence, the "difference" between 1993 and 1993 is the cumulative number from 3 to 1991
That is 3 + 4 + 5 + +1990+1991=1983033
So the 1993 number is 1983033 + 4 = 1983037
The remainder is 2
When the working hours are fixed, what is the proportion between the total amount of work and the working efficiency
When the work efficiency is constant, what is the proportion between the total amount of work and the working hours
When the total amount of work is fixed, what is the proportion between work efficiency and working hours
When the working hours are fixed, the total amount of work is in direct proportion to the working efficiency
When the work efficiency is constant, the total amount of work is in direct proportion to the working time
When the total amount of work is fixed, the working efficiency is inversely proportional to the working time
What is the general solution of Y '' + 6y '- 9y = 4 (x ^ 2) e ^ 2x
Characteristic equation R ^ 2 + 6r-9 = 0
r=(-6±6√2)/2=(-3±3√2)
So the general solution is y = C1E ^ ((- 3-3 √ 2) x) + c2e ^ ((- 3 + 3 √ 2) x)
Use a piece of fan-shaped paper with a center angle of 72 degrees and an area of 62.8 square centimeters to roll it into a large cone. The area of the bottom of the cone is______ Square centimeter
62.8 △ 72360 = 314 (square centimeter) the square of the radius of the circle is: 314 △ 3.14 = 100 (square centimeter) 100 = 10 × 10, so the radius is 10 centimeter, 2 × 3.14 × 10 × 72360 = 62.8 × 15 = 12.56 (centimeter) 12.56 △ 3.14 △ 2 = 2 (centimeter) 3.14 × 22 = 3.14 × 4 = 12.56 (square centimeter)
Calculate 3 / 2 plus 2 / 1 and check
3/2＋2/1
=3/2＋2
=1.5＋2
=3.5
checking calculation:
3.5－2/1=3,5－2=1.5=3/2
When a circle is enlarged, its area is 8 times more than the original, and its perimeter is 50.24 times more than the original?
8+1=9=3x3
The original radius is 50.24 △ (3-1) × (2x3.14) = 3M
The original radius is 3x3.14 = 28.26 square meters
ABCD is a four digit number, and its nine times is DCBA. How many are a, B, C and D?
I will do, test you
A=1
B=0
C=8
D=9
A must be 1, then D is 9
Just push
The radius of a sector is 15, the center angle is 120 degrees, and the sector area is ()
Just count
235.5
Narrate and prove the summation formula of arithmetic sequence
General term formula: an = a1 + (n-1) d an = am + (n-m) d the sum of the first n terms of the arithmetic sequence: SN = [n (a1 + an)] / 2; Sn = Na1 + [n (n-1) D] / 2 the sum of the arithmetic sequence: the sum of the arithmetic sequence = (mantissa + mantissa) * the number of items / 2; the formula of the number of items: the number of items of the arithmetic sequence = [(mantissa - first
First grade English speech
There is an urgent need for an English speech,
The time is about two or three minutes, with Chinese
But it doesn't seem to be what I want
I LOVE ENGLISHDear teacher and c lassmates:I am very glad to make a speech here in this class again!This time,I'd like to talk something about English.I love English.English language is now used everyw...
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