In ancient China, the mathematician who calculated pi to 7 decimal places was______ , whose value is_____

In ancient China, the mathematician who calculated pi to 7 decimal places was______ , whose value is_____

In the southern and Northern Dynasties (the second half of the 5th century AD), Zuchongzhi 3.1415926 was more than 1000 years earlier than the Europeans

Calculate the surface area and volume of the graph

(1) (12.8 × 1.6 + 12.8 × 1.4 + 1.6 × 1.4) × 2, = (20.48 + 17.92 + 2.24) × 2, = 40.64 × 2, = 81.28 (square decimeter), 12.8 × 1.6 × 1.4 = 28.672 (cubic decimeter), a: the surface area of the cuboid is 81.28 square decimeter, the volume is 28.672 cubic decimeter

F (E) = x square -- 2x + 3, 2 ≤ x ≤ 3

Let e ^ x = t
∴x=lnt e²

What's the meaning of "integer a can be divided by integer B"
Is a divided by B or B divided by a? Why is a called a multiple of B? B is called a divisor of a

If an integer can be divided by another integer, this integer is a multiple of another integer. For example, 15 can be divided by 3 or 5, so 15 is a multiple of 3 and also a multiple of 5
This sentence means a divided by B

A focal point on the x-axis is perpendicular to the two ends of the minor axis, and the distance between the focal point and its directrix is 2
emergency

A focus on the x-axis is perpendicular to the two ends of the minor axis
So B = C, b square + C square = a square
The distance between focus and guide line is 2, there are two possibilities
The solution of focal line on the same half axis: a square / C-C = 2 leads to a = 2 radical 2, B = C = 2
The focal line is not on the same half axis: a square / C + C = 2, a = (2 radical 2) / 3, B = C = 2 / 3

If the sum of two prime numbers is 19, then the product of the two prime numbers is 19______ ．

The product of the two primes is: 2 × 17 = 34. So the answer is: 34

How to draw the function image of y = - X-1 \ + 5? (piecewise function)

When x

The quadratic function f (x) has the minimum value f (- 1) = - 1, and its image passes through the origin, if the first n terms of the sequence {an} and Sn satisfy Sn = f (n)
The quadratic function f (x) has the minimum value f (- 1) = - 1, and its image passes through the origin, if the first n terms and Sn of sequence {a subscript n} satisfy Sn = f (n). (1) find a subscript n, and prove that {a subscript n} is an arithmetic sequence; (2) let B subscript n = 2, superscript a subscript n, find the first n terms and sum of sequence {B subscript n}

Let f (x) = a (x + 1) ^ 2 - 1F (0) = A-1 = 0A = 1, so f (x) = x ^ 2 + 2x, that is, f (n) = n ^ 2 + 2nan = sn-sn-1 = n ^ 2 + 2n - (n-1) ^ 2-2 (n-1) = 2n + 1 = 3 + 2 (n-1), so an is an arithmetic sequence with 3 first term and 2 tolerance, BN = 2 ^ an = 2 ^ (2n + 1) = 8x4 ^ (n-1), so BN is an arithmetic sequence with 8 first term and 4 common ratio

Given XYZ + XY + YZ + ZX + X + y + Z = 1975, find the natural number x, y, Z satisfying the equation
Trouble
xyz+xy+yz+zx+x+y+z= (xyz + xy) + (yz + y) + (zx + x) + z
= xy(z + 1) + y(z + 1) + x(z + 1) + z
= (z + 1)(xy + y + x + 1)+1
= (z + 1)(x + 1)(y + 1)+1
= 1975
So 4 * 2 * 247 = 1976
Answer: chsm4113 - Department president grade 12 2009-11-6 23:28 friend, your answer seems to be missing the + 1 one, oh, may be missing it,

XYZ + XY + YZ + ZX + X + y + Z = (XYZ + XY) + (YZ + y) + (ZX + x) + Z = XY (Z + 1) + y (Z + 1) + X (Z + 1) + Z = (Z + 1) (XY + y + X + 1) = (Z + 1) (x + 1) (y + 1) = 1975 = 5 * 5 * 79

(x, y) joint probability density f (x, y) = 3Y, 0

Does the title mean this?
f(x,y)=3y (0