The ratio of story books to literature books is 24:25, and the ratio of story books to science books is 8:9?

The ratio of story books to literature books is 24:25, and the ratio of story books to science books is 8:9?

Science book: literature book = (9 / 8): (25 / 24) = 27:25

The ratio of story books to Literature and art books is 32:27, the ratio of story books to science and technology books is 8:9, and the ratio of science and technology books to Literature and art books is ()

The ratio of story books to literature books is 32:27,
The ratio of story books to science and technology books is 8:9 = 32:36
therefore
The ratio of science and technology books to Literature and art books is 36:27 = 4:3

The length of a rectangular vegetable field is 24 meters. If the length and width of the rectangular vegetable field are increased by 5 meters, the area will increase by 220 square meters
Urgent... Fast... Detailed, don't say that
Let the width be B
Then (5 + 24) (B + 5) - 24B = 220
Because it's "increasing 220" instead of "increasing to 220"
The solution is b = 15
I don't understand. Give me a detailed procedure

Draw a picture to help understand. The added part includes three parts: length * 5, width * 5 and 5 * 5
The original width is (220-24 * 5-5 * 5) / 5 = 15m
The statement of the first floor is wrong, the title is right

The cube of B is 8. What is B

The cube of B is 8
b=2

The minimum positive period of the function y = cos (3 π 2 − x) cos (3 π − x) is______ ．

Because y = cos (3 π 2 − x) cos (3 π − x), combined with the induction formula, y = TaNx can be obtained. Therefore, according to the periodic formula t = π ω of tangent function, the period of y = cos (3 π 2 − x) cos (3 π − x) is: π. So the answer is: π

A piece of tablecloth is 2 meters long and 1.5 meters wide. It is laid on a square table with a cloth curtain of the same width hanging down all around. It is known that the area of the table is exactly half that of the tablecloth
The length and width of the desktop

Let the table length be x m, then: cloth curtain = (2-x) m, table width = 1.5 - (2-x) = x-0.5 M
2*1.5=2*x*(x-0.5)
3=2x²-x
(2x-3)(x+1)=0
x1=1.5
X2 = - 1
The length and width of the table are 1.5m and 1m respectively

A cylinder and a cone have the same base and height. If the volume of the cone is 30 cubic decimeters less than that of the cylinder, then the volume of the cone is______ Cubic decimeter, cylinder volume is______ ．

A: the volume of a cone is 15 cubic decimeters, and the volume of a cylinder is 545 cubic decimeters. So the answer is: 15; 45

What are the special symbols of mathematics?

Capital and small English phonetic alphabet phonetic alphabet Chinese phonetic alphabet alpha alpha alpha alpha alpha beta beta beta beta beta gamma gamma gamma gamma gamma gamma gamma gamma gamma gamma alpha alpha alpha alpha beta beta beta beta beta beta beta beta beta beta beta beta beta beta beta beta beta gamma gamma gamma gamma gamma gamma gamma gamma gamma alpha alpha alpha alpha alpha alpha alpha alpha alpha alpha alpha alpha alpha alpha beta beta beta beta beta beta beta beta beta beta beta

Finding the derivative or differential of y = sin2x / (1 + cosx)

y=sin2x/(1+cosx)
=2cosx*sinx/(1+cosx)
=2cosxtan(x/2)
y'=2tan(x/2)*(-sinx)+2cosx*sec²(x/2)*1/2
=cosxsec²(x/2)-2sinxtan(x/2)
=2cosx-2/(1+cosx)
Differential: dy = [2cosx-2 / (1 + cosx)] DX
x=tcost,y=tsint
dx/dt=cost+t(-sint)=cost-tsint
dy/dt=sint+tcost=sint+tcost
dy/dx=(dy/dt)/(dx/dt)
=(sint+tcost)/(cost-tsint)

Can a 5N spring dynamometer be used to measure the gravity of an iron block with a volume of 100cm3 and a density of 7.9 × 103kg / m3?

It is known that v = 100cm3, ρ = 7.9 × 103kg / m3, M = ρ, v = 7.9g/cm3 × 100cm3 = 790g, g = mg = 0.79kg × 10N / kg = 7.9n7.9n ＞ 5N