18x + 2 (2x-1) = 18-3 (x + 1),

18x + 2 (2x-1) = 18-3 (x + 1),

18X+4X-2=18-3X-3
22X-2=15-3X

Thank you, please hurry up! (2x ^ 2-18) / (4-4x + x ^ 2) / [(x + 3) * (3-x) / (x ^ 2-2x-3)]

(2x^2-18)/(4-4x+x^2)/[(x+3)*(3-x)/(x^2-2x-3)]
=2(x+3)（x-3)/(x-2)^2*(x-3)(x+1)/(x+3)(3-x)
=-2(x-3)(x+1)/(x-2)^2

-2X + 6 = - 12-3x find x

Transference
3x-2x=-12-6
x=-18

Xiaoming and Xiaogang are 28 kilometers apart. They agreed to meet each other and set out at the same time. Xiaoming's speed is 8 kilometers per hour, and Xiaogang's speed is 6 kilometers per hour. Xiaoming's father found that Xiaoming had nothing with him 30 minutes after Xiaoming set out, so he chased Xiaoming at the speed of 10 kilometers per hour. When Xiaoming and Xiaogang met, did his father catch up with Xiaoming? If he wanted to catch up with Xiaoming, At least what's the speed?
Don't look for it on the Internet for me. I'll look for it myself
Which is right

Let two people meet for X hours
8*X+6X=28
X=2
At this time, Xiaoming's father's time is 1.5 hours
8 * 2-1.5 * 10 = 1km
When Xiao Ming and Xiao Gang met, his father didn't catch up with him
Suppose dad wants to catch up with Xiao Ming at a speed of Y km / h
1.5Y=8*2
Y=32/3
Dad's speed is 32 / 3 km / h

English translation
1.standard of accommodation
2. What is the difference between the usage of last summer and during last summer

1. Accommodation standard
2. Last summer is the past tense, and the verb is in the past tense; during is in the past tense A moment in a certain period is also in the past tense
I went on a trip last summer
I had a travel last summer.
I had a travel during last summer

How to cut folk paper-cut? Is it all cut out with scissors or with templates?
Is there a video to see the paper cutting process?

Paper cuts with scissors is one of the most popular traditional folk decorative arts in China. According to archaeology, its history can be traced back to the sixth century A.D., but people think that it actually started hundreds of years earlier than that

The sum of a cuboid's length and width is 9 cm, the sum of its length and height is 8 cm, and the sum of its width and height is 7 cm. What is the surface area of the cuboid in square centimeters

The sum of 3 edges is (9 + 8 + 7) △ 2 = 12cm
Height 12-9 = 3cm
Width 12-8 = 4cm
Length 12-7 = 5cm
Surface area
2x(5x4+5x3+4x3)
=2x(20+15+12)
=2x47
=94 square centimeters
If you don't understand this question, you can ask,

1. The number a is 8, the number B is 3 / 4 of it, and the number B is ()
2.24 1 times 6 means (), 6 times 24 1 means ()
1 / 24 divided by 6 means (), 6 divided by 1 / 24 means ()
The increase of 3.20 meters by one third is () meters, and the decrease of 20 meters by one third is () meters
4. A project will be completed in 12 days. How many parts of the project will be completed tomorrow, and how many parts of the project will be completed in 5 days
3 / 8 of 5.40 kg is () kg, 3 / 8 of () kg is 30 kg

1.6
2. What is the six times of one in 24, what is one in 24 of 6, what is the quotient of one in 26 and six, and how many times of one in 24
3. Twenty six and two-thirds meters, thirteen and one-third meters
Answer: one sixth of the project will be completed tomorrow, and five twelfth of the project will be completed in five days
5.15kg, 80kg

The deformation of junior high school formula
a²+4a-5=0
What formula is used to form (a + 5) (A-1) = 0?
How to do this kind of problem, I will not be this. Seek detailed explanation

No formula is used
The factorization factor is used and the cross multiplication is used to decompose the factor

The story books in the library are one third of the science books,
The story books in the library are one third of the science and technology books. There are 36 more science and technology books than three fourths of the story books. How many science and technology books do the library have?

The story books in the library are one third of the science and technology books
It can also be said that the number of science and technology books is three times that of story books
There are 36 science books more than three-quarters of story books
That's three times more than three quarters of storybooks
Therefore, there are 36 story books (3-3 / 4) = 16
There are 16 × 3 = 48 scientific and technological books