The solution set of inequality x ^ 2-3x-4 / x ^ 2 + 3x-10 ≥ 1 is

The solution set of inequality x ^ 2-3x-4 / x ^ 2 + 3x-10 ≥ 1 is

x^2-3x-4/x^2+3x-10≥1
[x^2-3x-4]/[x^2+3x-10]-1≥0
(x^2-3x-4-x^2-3x+10)/(x^2+3x-10)>=0
(-6x+6)/(x+5)(x-2)>=0
(6x-6)/(x+5)*(x-2)

What does 12 times 0.25 mean?

Represents the sum of 12 0.25

The speed of the earth's revolution around the sun is about 1.1 × 10 quintic km / h, and the propagation speed of sound in the air is about 340 m / s. try to compare the size,
Step by step, thank you

Convert to the same unit
Km / h can be converted to m / s or vice versa
1km/h=1000m/60min=1000m/3600s=5/18(m/s)
Multiply both sides by 18 / 5 at the same time
18/5km/h=1m/s
Then 340m / S = 340 * (18 / 5km / h) = 1224km / h
Obviously less than 110000km / h
Conclusion: M / S transform is km / h multiplied by 3.6

12 questions on page 9 of Volume II of Mathematics Education,

(1) Yes
(2) No
Correct answer: - 1 / 2x

The coordinates of the point a (1, - 2) which is symmetric about the X axis are______ The coordinates of the point a symmetrical about the origin are______ ．

The point P (m, n) has the coordinates p '(m, - n) about the x-axis symmetric point, and the coordinates P ″ (- m, - n) about the origin symmetric point. Therefore, the coordinates of point a (1, - 2) about the x-axis symmetric point are (1,2), and the coordinates about the origin symmetric point are (- 1,2)

What's the simple algorithm of multiplying 99 by 99 plus 99 in Grade Four

99*99+99=(99+1)*99=100*99=9900

1. The volume of nitric oxide and nitrogen dioxide mixture produced by the reaction of 32.64g copper with 140ml nitric acid of certain concentration is 11.2l
Volume of nitric oxide and nitrogen dioxide
2. Now, 8mol of sulfur dioxide and 6mol of oxygen are filled into a closed container for reaction. When 80% of sulfur dioxide is oxidized to sulfur trioxide, what are the amounts of sulfur dioxide, oxygen and sulfur trioxide in the reaction mixture? What is the average molecular weight?

1. Copper is 32.64/64 = 0.51mol
Because one Cu loses two electrons
The total number of electrons given is 1.02 mol
The valence of N varies from + 5 to + 2 and + 4
Let NO2 xmol no ymol be generated
So the electron is x + 3Y mol = 1.02mol
So x + 3Y = 1.02
And the total amount of gas is 11.2 / 22.4 = 0.5mol
x+y=0.5②
I know according to (1) and (2)
x=0.24mol
y=0.26mol
That is, no is 0.24 × 22.4 = 5.376l
No2 is 0.26 × 22.4 = 5.824l
2SO2+O2=2SO3
Start 8 60
Change - 6.4 - 3.2 + 6.4
Last 1.6 2.8 6.4
So the final SO2 is 1.6mol
O2 is 2.8 mol
So 3 is 6.4 mol
The total mass is 8 × (32 + 16 + 16) + 6 × 32 = 512 + 192 = 704g
The amount of total substance is 1.6 + 2.8 + 6.4 = 10.8mol
The average molecular weight is 704 / 10.8 = 65.19

The base and area of a triangle are equal to those of a parallelogram. The height of a parallelogram is 6cm. How to calculate the height of a triangle?

6 × 2 = 12cm the height of a triangle is 12cm

7.5-2.38 + 1.5-1.62 5.4 * 62 + 1.8 * 114 765 * 213 / 27 + 765 * 327 / 27

7.5-2.38+1.5-1.62
=7.5+1.5-（2.38+1.62）
=9-4
=5
5.4*62+1.8*114
=1.8*186+1.8*114
=1.8*（186+114）
=1.8*300
=540
765*213/27+765*327/27
=765*（213+327）/27
=765*540/27
=765*20
=15300
4.83*0.59+0.41*0.59-0.324*5.9
=4.83*0.59+0.41*0.59-3.24*0.59
=(4.83+0.41-3.24)*0.59
=2*0.59
=1.18

The process of applying Pythagorean theorem in Mathematics
There is a pool. The water surface is a square with a side length of 10 feet. In the center of the pool, there is a reed, which is 1 foot higher than the water surface. If you pull the reed to the midpoint of one side of the pool, its top just reaches the water surface. What is the depth of the water and the length of the reed?
A bamboo is 1 Zhang high. After it is broken, the top of the bamboo falls 3 feet from the bottom of the bamboo. What is the height of the broken bamboo from the ground?
On these two questions, please help me write the process~~

First question
The depth of the pool is x feet, and the length of the reed is x + 1 feet
x^2+5^2=(x+1)^2
x^2+25=x^2+2x+1
2x=24
x=12
The depth of the pool and the length of the reed are 12 feet and 13 feet respectively
Second question:
Suppose that the height of the fracture from the ground is x feet
The broken part is 10-x feet
Obviously, the broken part is the hypotenuse
So (10-x) ^ 2 = x ^ 2 + 3 ^ 2
x^2-20x+100=x^2+9
20x=91
x=4.55
So it's 4.55 feet