What is the rate of progress between kilometers and meters, and between meters and decimeters?

It's all a thousand

A hexagonal prism model is 5cm long at the bottom and 4cm long at the side. What is the sum of the area of this hexagonal prism?

4 * 5 * 6 equals 120

How does P = 4sin α get to X & # 178; + (Y-2) &# 178; = 4

p=4sinα
p²=4psinα
x²+y²=4y
x²+y²-4y=0
x²+y²-4y+4=4
x²+（y-2）²=4

Sum: 2 * 5 + 3 * 6 + 4 * 7 +. + n (n + 3)

N (n + 3) = n ^ 2 + 3N, so 2 * 5 + 3 * 6 + 4 * 7 +. + n (n + 3)
=3（2+3+…… +n）+（2^2+3^2+…… n^2)
=3{[n(n+1)/2]-1}+[n(n+1)(2n+1)]/6 - 1
=(n^3+6n^2+5n-12)/3

One of the correct explanations for the use of dashes in each sentence is
a. There will only be crucian carp in the river, there will not be this number of fish
b. "It's hot today - when are you going to Shanghai?" Zhang Qiang said to Xiao Wang
c. For partners fighting for the same purpose, his weapon - the weapon of Art - is of great significance
d. Some popular stories about gods and Demons tend to change gradually. The demons in them become more and more lovely, and some even become positive heroes
e. The wind, embracing the spray, pounced on the bank
f. "You quickly promise Yu Changxiang and save Dad! Brother Shousheng, you --" Miss Lin suddenly blushed and ran away
A. Note conversion topic annotation supplementary note sound lengthening sound lengthening
B. The supplementary explanation transforms the topic, adds the progressive sound, lengthens the discourse interruption
C. Note turn, note progression, voice prolongation, discourse interruption
D. The progressive transformation of topic entrainment adds that voice prolongs discourse interruption

It is known that the focal points of the ellipse x ^ 2 / 45 + y ^ 2 / 20 = 1 are F1, F2, crossing the center O, making a straight line L and the ellipse intersecting at two points ab,
If s triangle abf2 = 20, find the equation of ab

Let the straight line be y = KX, and substitute it into a (x1, Y1) B (X2, Y2) elliptic equation to simplify it. We can get: (9K ^ 2 + 4) x ^ 2-180 = 0, then X1 + x2 = 0, x1x2 = - 180 / (9K ^ 2 + 4), so the distance between ab | = √ (1 + K ^ 2) [(x1 + x2) ^ 2-4x1x2] F2 (5,0) and ab is d = | 5K | / √ (k ^ 2 + 1) and S = 1 / 2 ab | d = 20

Problem solving mathematics: the perimeter of a rectangle is 64cm, and the ratio of length to width is 5:3. How many square meters is the area of the rectangle?

Length: 64 △ 2 × 5 / (3 + 5) = 20cm
Width: 64 △ 2 × 3 / (3 + 5) = 12cm
Area: 20 × 12 = 240 square centimeter

Given that sin α cos α = 1 / 8 and α belongs to (Γ / 4, Γ / 2), find Tan α

1 = cosa ^ 2 + Sina ^ 2, sinacosa = sinacosa / 1 = sinacosa / (COSA ^ 2 + Sina ^ 2) = 1 / 8, the numerator is also divided by cosa ^ 2 to get: Tana / (1 + Tana ^ 2) = 1 / 8. So, Tana ^ 2-8tana + 1 = 0tana = 4 ± root sign 15. Because α belongs to (π / 4, π / 2), Tana monotonically increases in this interval

Given the quadratic equation of one variable 8x - (2m + 1) x + M-7 = 0, the values of M are obtained according to the following conditions:
(1) Two reciprocal numbers (2) two opposite numbers (3) one is zero (4) the sum of squares of two is 1 / 64

Let two of the equations be x1, x2. From the meaning of the problem, we can get X1 + x2 = (2m + 1) / 8, X1 * x2 = (M-7) / 8 (1) two reciprocal numbers are X1 * x2 = (M-7) / 8 = 1, M = 15 (2) two reciprocal numbers are X1 + x2 = (2m + 1) / 8 = 0, M = - 1 / 2 (3) one of them is zero, we can get X1 * x2 = (M-7) / 8 = 0, M = 7 (4)

Given the function y = x / K (k is not equal to 0), the value of Y decreases with the increase of X. point a (3, K-2) is on the image of this function to find the value of K

It should be y = K / X
By substituting the function K-2 = K / 3, we get 3k-6 = K. by solving this equation, we get k = 3

What is the rate of progress between kilometers and meters, and between meters and decimeters?