Junior high school math problems, 100,000 urgent, well read, well informed

Yes, in order to avoid a situation where there are two answers, the convention is to use the same uppercase or lowercase for diagonal and opposite sides. Add to the question if you have already told you that the triangle is a right triangle"c = 90 degrees"It tells you that the A and B sides are all right-angled sides, and only the C side is the required chord length.

Your thinking is very creative, and strictly speaking, you have caught the loopholes in the topic.

Support you and the teacher to argue with reason, if you meet a good teacher, they will return your scores.

However, if you encounter the high school entrance examination or the college entrance examination, it is recommended that you still follow the convention to do it, because you can save time, and if you have more time, you can do it in two situations, but you must write it clearly.

The reason is that in all triangle diagrams, the opposite side of the angle must be the same as the angle, that is, the opposite side of the angle A must be a

This statement is true !I'm sure you can find this phrase in the book.

In the same way, the opposite side of angle a is the side a.

It's conventional, and you're thinking too complicated. However, the teacher will not deduct points depending on the situation.

It's a fixed usage, with corners being uppercase and edges being lowercase, and they should correspond to each other.

Like axioms, it is impossible but universally accepted.

At the same time, hundreds of schools of thought are bright and deaf.

The early success is well deserved.

1.Jia Tanchun.

2.The prince she saved.

3."The Outer History of Confucianism".

4.Li trembled and chabai's poems.

5.Tao Yuanming.

6.Sima Qian is quiet.

7."Wood Finger Cave Zha Lan Poem".

8.The Book of Songs

1. Rule: 14 * 16 = 100 * (1 + 1) + 4 * 6, which is equivalent to 1 * (1 + 1) as a hundred, and 4 * 6 = 24 is directly placed behind 1 * (1 + 1) = 2, and the same is true for the next one.

2. There are above rules, there are.

124 * 126 = 1200 * (12 + 1) + 4 * 6 = 15600 + 24 = 15624 (equivalent to 12 * (12 + 1) as a hundred, and 4 * 6 = 24 directly after 156).

3. Similarly, more than ten digits (hundreds, thousands, etc.) are the same, and the multiplication of more than two digits with single digits is equal to 10, can have such a rule:

10m+a）*（10m+b）=100*m(m+1)+a*b

For example: 67*63=600*(6+1)+3*7=4221 (6*7=42 as a hundred, 3*7 as a single ten-digit number, or as a direct report of 3*7 results and put it after 42 to form a multi-digit number).

1. This law is:

For a two-digit number, when the tens digits are the same, and the single digits are 4 and 6 respectively, the product of the multiplication of the two digits can be calculated as follows: add the ten digits to one, multiply by the ten digits, and then add 24 to the end

This rule can also be used when the three-digit product is used, 124*126 is equal to 12*13 and then 24 is added after 156, which is 124*126=15624

3. In fact, two two-digit numbers with the same ten-digit number, if their single digits are added to 10, they can be done with the rule of 1, that is: after adding one to the ten-digit number, multiply by the ten-digit number, and then make up the product of the multiplication of the single digit, such as: 38*32=3*4 supplemental column 8*2=121656*54=3024 and so on.

100n(n+1)+24 124*126=100*12*13+24=15624 The rule is that the two multiplied numbers must be the same except for the single digits, and the addition of the two single digits must be = 10, so that both numbers conform to this law.

It's simple, but it just doesn't tell you.

First of all, interest.

Second, choose books based on your interests. Choose classics from the ancient, modern, Chinese and foreign classics that interest you. You can re-read a book that you particularly like or have literary value.

But beware, to have the right purpose of reading, some people read a lot of books, expand their knowledge, just to show off their knowledge to others, to satisfy their vanity, this is a very shallow idea, a blasphemy of the classics. The real purpose of reading is to cultivate human feelings, cultivate sentiments, and improve one's own cultural accomplishment, moral accomplishment, and spiritual realm through reading.

In this way, the content you read will be transformed into something inside you through understanding and understanding, and naturally, your body will exude a kind of scholarly temperament, which will also be of great benefit to future decision-making in society. Come on.

Buy a book like the Great View of Chinese and Foreign Literature and Art This kind of book will have a brief introduction and brief review of Chinese and foreign masterpieces, if you really read these famous books, won't you be tired?

It is impossible to read all the books in life, but it is also good to be able to read a few more, not only to read more, but also how to grasp the core ideas, have their own experience and be able to flexibly use the knowledge they have learned to be a real expo, on the contrary, what is the meaning of reading without weight!

If you can't read it, don't force it, otherwise it's a waste of time, and if you don't read the true meaning, the main thing is to cultivate interest, and if you are interested, you will take the initiative to read.

Choose the environment that suits you, put down the lyricism ** that suits you, and then sit on a recliner and read a book, it's easy to get into the role.

In addition, it is important to insist, and God rewards hard work.

If you are still in the lower grades, you don't need to prepare for exams such as the college entrance examination. You just don't look at the vulgar ** now. Take a look at the **, essay collection of modern masters. Or ancient literature. It's all good.

How to read a wide range of books, then read more books and read good books. Don't spend your spare time playing, read a lot.

Solution: If the channel width is x, then the sum of the vertical channel areas is 80x+80x=160x;

The median line of the large trapezoid is (100+180) 2=140, so the sum of the upper and lower bottoms of the transverse channel is 140x2=280

That is, the area of the transverse trapezoid is 280x 2=140x

The area of the overlapping part of the three channels is 2x

Therefore, the actual area of the channel is 160x+140x-2x =300x-2xAccording to the title:

6(300x-2x²)=(100+180)*80/23x²-450x+2800=0.

Solution: x (

A: The width of the channel should be about.

Using equations to solve problems is to set up unknowns according to the equivalence relationship in the problem, list the equations, and check the root after finding the solution, that is, the solution of the equation should be suitable for the actual problem.

Make the isosceles trapezoidal one, and the top and bottom of the rectangle are equal to 180m, and the equation is:

The width of the aisle is xm, 80-x) (180-x) = 180 * 80 * 5 6x -260x + 2400 = 0x=

One (1) (m+6)m=m squared + 6m

2) 3 2m squared If there are y seats in the sedan car, then the number of rows is 2 3y, so 2 3y=m, so y=3 2m

2: (1) The second team is 2*100-25=175, and the third team is 100 2+42=92

2) Two: 2 * 240-25 = 455 Three 240 2 + 42 = 162 Three: Sell the price of rotten hail A (1 + 22%) = A + Yuan) The current price is 85% (A + Calculate the hunger and sail yourself.

Profit 85% (A+.)

Solution: Extend AP1 to E

ab∥cd∠aec＝∠bap1＝α

p2p1e＝180-∠ap1p2, ∠p2fe＝180-∠p2fc，∠aec+∠p2p1e+∠p1p2f+∠p2fe＝360

+180-∠ap1p2+∠p1p2f+180-β＝360∴∠p1p2f-∠ap1p2＝β-

The math tutoring team answered your questions, please accept it in time if you understand.

After P1 and P2 are used as a straight line parallel to AB, the law will be found according to the isotopic angle, AP1P2 minus P1P2F is equal to minus .

Make two parallel guides, equal, = +