1. The third power of factoring factor A (X-2) + a (2-x) 2. Square of factoring factor (A's square + 4B's Square) - 16A's Square, B's Square 3. Solving equations 0.2x + 0.3y = - 0.1 0.5x+y/3=1 4. First simplify, then evaluate the square of (a + 2) - A (a + 3), where a = 1 / 2

1. The third power of factoring factor A (X-2) + a (2-x) 2. Square of factoring factor (A's square + 4B's Square) - 16A's Square, B's Square 3. Solving equations 0.2x + 0.3y = - 0.1 0.5x+y/3=1 4. First simplify, then evaluate the square of (a + 2) - A (a + 3), where a = 1 / 2

How to do the last question of the song of nightingale in Chinese exercise book

Although I am in the sixth grade, I can still find the exercise book in the fourth grade
Do you want to read the following and answer the questions?
1. The village was burned intentionally in order to attract the enemy
2. In order to attract others and attract the attention of the enemy
3. The child is waiting for the enemy, luring the enemy

Among the numbers 3, 8, 27, 51, 43, 2, 24, 1 and 87, prime numbers have () combined numbers have () odd numbers have () even numbers have ()

Among the numbers 3, 8, 27, 51, 43, 2, 24, 1 and 87, prime numbers have (3, 43, 2), composite numbers have (8, 27, 51, 24), odd numbers have (3, 27, 51, 43, 1) and even numbers have (8, 2, 24)

The shop brought in a batch of washing machines and sold 24 of them. The ratio of the number sold to the number left is 3:5. How many washing machines are there in total?

24 △ 3 × 5, = 8 × 5, = 40 (sets); 40 + 24 = 64 (sets); answer: there are 64 washing machines in total

Math problem! It's about finding rules~~~
Observe the following formulas: 2 × 5, - 4 × 5 ^ 2,6 × 5 ^ 3, - 8 × 5 ^ 4 Then the nth formula is_________

(-1)^(n+1)×2×n×5^n

Do you have to write "transfer term" and "merge similar term" when solving the equation!

Can not write ah. If your teacher requires to write, you still write better; if the exam, in order to save time, or do not write ha! Ha ha! We have to test, come on!

There is a rectangular field. If the length of the field increases by 6 meters or the width increases by 4 meters, the area will increase by 48 square meters. How many square meters is the field?
I'm going to school tomorrow!

First, see the title "or"
Let the original length be x and the width be y
So 6 * y = 48
Y=8
4*X=48
X=12
So the original area of this field is 8 * 12 = 96
Answer: Yes

1. Verification: the angle is divided into four equal parts by three diagonals drawn from the vertex of an inner angle of a regular hexagon
2. It is known that AB is an edge of the inscribed regular undecanon of the circle O, and AC is an edge of the inscribed regular pentagonal of the circle O. the degree of the central angle of the inscribed regular polygon with BC as the edge is obtained
Ah, ah, wrong number. It's a regular decagon

① Method 1: draw the circumscribed circle of a regular hexagon. You can see that the circumscribed circle is exactly divided into six equal parts by the vertex of the regular hexagon
According to the theorem that the circle angles of the same arc are equal to each other, we can get the following results
The angle of a regular hexagon is quartered by three diagonals drawn from the vertex of the angle
Method 2: let the hexagon be ABCDEF, and draw three diagonals AC, ad and AE at a. the verification angle BAC = CAD = DAE = EAF
Proof: because ABCDEF is a regular hexagon, so ad / / BC / / ef (this should not need proof, if you need to reply to me)
Because AB = BC = > BAC = BCA, BCA = CAD is known from BC / / AD, that is, BAC = CAD (1)
Similarly, FAE = FEA = ead (2)
In addition, ABC = AFE, ab = AF, BC = EF = > triangle ABC is congruent with triangle AFE, and AE = AC
Because ad has the same edge, CD = De, AE = AC = > triangle ade is equal to triangle CAD, and CAD = ead (3) is obtained
Combining with (1), (2), (3), we get BAC = CAD = DAE = DAE. I don't know if you can understand the above proof. It's very specific!
(the above three letters are all a corner, and the middle letter is the vertex of the corner.)
② I only know a regular decagon, not a decagon,

A color TV first cut its price by 20%, and now how much does it need to increase its price before it can be sold at the original price?

A: the price should be increased by 25%

Given that 3x + 2Y = 44, 2x + 3Y = 46, then x=______ ，y=______ ．

3x + 2Y = 44, two sides of the equation multiply by 2, 6x + 4Y = 88, ①; 2x + 3Y = 46, two sides of the equation multiply by 3, 6x + 9y = 138, ②; ② subtract ①, 5Y = 138-885y = 50 & nbsp; y = 10; substitute y into 3x + 2Y = 44, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 3x + 20 = 44 & nbsp; & nbsp; 3x + 20 = 44-2