What is the original pricing formula in the application problem of linear equation with one variable?

What is the original pricing formula in the application problem of linear equation with one variable?

There is no such formula. If there is, it's not a formula. It's a formula made by yourself
When prices rise:
Original price × (1 + price increase percentage) = current price
When reducing prices:
Original price × (1 + percentage of price reduction) = current price
If we must say formula, this should be it

For a job, if Party A does it for five hours and Party B does it for three hours, it will be finished. For example, if Party B does it for nine hours and Party A does it for two hours, it will be finished after Party A does it for four hours
B. it will take several hours to finish

If Party A does it for 5 hours, then Party B does it for 3 hours. If Party B does it for 9 hours, then Party A does it for 2 hours
Explain a do 3 hours, equivalent to B do 6 hours
Therefore, to complete this work alone, Party B needs 3 + 5 * 2 = 13 hours, and Party A needs 13 / 2 = 6 / 5 hours
A did the work for 4 hours = B did it for 8 hours
B need to do 13-8 = 5 hours

5 liter 5 ml = () cubic decimeter

One liter is one cubic decimeter
One milliliter is equal to 0.001 cubic decimeter
So fill in 5.005

People's education press eighth grade English all knowledge, grammar

1. Comparative degree of adjective and adverb
(1) Generally after adjective or adverb + ER
older taller longer stronger, etc
(2) Polysyllabic word before + more
more interesting, etc.
(3) Double write the last letter, and then + ER
bigger fatter, etc.
(4) Change y to I and then + ER
heavier, earlier
(5) Irregular change:
well-better, much/many-more, etc.
2. Imperative sentence:
Sit down please
Don’t sit down, please.
3. There be structure
There is a
There are …
Is there ? Yes, there is./ No, there isn’t.
Are there… ? Yes, there are. /No, there aren’t.
There isn't . There aren’t… .
Usually, of course, every day, some times
Form:
affirmative sentence:
I go to school on foot every day.
She goes to school on foot every day.
Be + Verb + ing
eg: I am(not) doing my homework.
You/We/They are(not) reading.
He/She/It is(not) eating.
The form of verb ing
Most verbs +ing walk—walking
Verbs ending in e -e + ing come—coming
Short verbs ending in a vowel + a consonant run –running swim—swimming
six
Key sentence patterns:
How many + plural + are there?
This sentence pattern is a special question, which means "how many are there?" it is often used to ask questions about the number of countable nouns. How many is followed by the plural of countable nouns
How many apples are there on the table?
2.. What about ...?
"About" is a preposition, followed by nouns, pronouns or verbs
What about that computer?
My gloves are red. What about their?
What about playing games after school?
3. What time is it?/What\'s the time?
In English, these two sentence patterns are often used to ask the present time, which means "what time is it?" or "what time is it?" the answer is usually "it's + time." it refers to time, which can not be translated. Please is often added at the end of the sentence to express the euphemism
What time is it, please?
-It's about a quarter past ten
4. What colour + be + subject?
When asking about the color of something, it is usually used as a special question beginning with what colour. The answer is usually "it's / they're +"
-What colour is her dress?
-It's light blue
5. Who + noun + be + others? / who + be + noun?
These two sentence patterns are often used in English to ask who owns something
Who cup is that?
Who are these photos?
6. It's time for + sth. /It's time to do sth. / It's time for sb. to do sth.
It's time to do something
It's time for school
It's time to have supper
7. Alternative question: alternative question is to use or to connect the two parts of the question for choice. The answer must be a complete sentence or its omitted form, not yes or no
Generally, two or more possibilities are put forward and the other party is asked which one to choose. Its structure can be either general questions or special questions. The two parts for choice are connected by or, the former reads ascending tone and the latter reads descending tone
e.g. Will you go there by bus or by train?
What would you like, coffee or tea?
How many pens do you have, one or two?
The answer to the choice question must be a complete sentence or its ellipsis, not yes or no
e.g. Do you go to school by bus or by bike?
By bus.
Which would you like, tea or coffee? Coffee.
Choice questions evolved from general questions
e.g. Is it right or wrong?
Were you or he there?
Are they reading, chatting or watching TV?
Selective questions evolved from special questions
e.g. Which do you like better, coffee or milk?
What color is it, red, blue or yellow?
Where are you going, to the classroom or to the library?
The choice question constructed by or not
e.g. Do you want to buy it or not?
Are you ready or not
8. In addition, the special structure of "to be + going + infinitive" can indicate the action to be carried out in the future
He is going to tell me tomorrow
Exercises:
There are ____ There is a little water in the bottle
There are ____ There is no water in the bottle
There are ____ How many students are there in the classroom
There are ____ Students in the classroom (c)
There are ____ How many apples grow on the trees
The options are unified as
A、little B、a little C、few D、a few
3. Of course,every one of us_ 1__ to make friends like food---they are useful to us,and they can help us when we are _ 2__ need._ 3__ you can make as many friends of this kind as possible.
(1) A.want B.will want C.wants
(2) A.in B.on C.for D.of
(3) A.And B.But C.So D.Because
Answer: CAC
4.Twenty minutes later,John_ 1__ a tree.His leg was broken,and it hurt _ 2__ .
Mr smith _ 3__ to mend the chair.then he_ 4__ himself with a hammer.
(1) A.fell over B.fell from C.fell down D.fell on
(2) A.all the day B.all day C.whole day D.all days
(3) A.starts B.started C.was starting
(4) A.damaged B.knocked C.hit D.cut
Answer: babc

There are 8 white balls, 7 red balls and 5 yellow balls in the bag. In order to keep at least 4 balls of the same color and at least 3 balls of another color in the bag, how many balls can you take out from the bag at most?

According to the stem analysis, only 10 balls can be taken out, that is, the remaining 10 balls in the pocket. No matter how you allocate them, there must be at least 4 balls in one of the three colors. In this case, you can ensure that there are "at least 4 balls in the same color, and at least 3 balls in another color" in the pocket. A: you can take out 10 balls at most

How many hectares are 4 hectares and 80 square meters

1 ha = 10000 M2
80 m2 = 0.008 ha
4 + 0.008 = 4.008 (HA)
A: 4 hectares and 80 square meters are equal to 4.008 hectares

Xiaohua paid 16.5 yuan for 3kg of pear and 3kg of apple, while Xiaoli paid 10.5 yuan for 3kg of apple and 1kg of pear. How much for 1kg of apple and 1kg of pear?

Unit price of pear: (16.5-10.5) / (3-1), = 6 △ 2, = 3 (yuan), unit price of apple: (10.5-3) / (3), = 7.5 △ 3, = 2.5 (yuan), answer: 1 kg Apple 2.5 yuan, 1 kg pear 3 yuan

Practical problems in grade five of primary school (with answers)
It's better not to repeat the process with others~~~

1. A and B leave from ab at the same time. A drives 5 / 11 of the whole journey. If a drives 4.5 kilometers per hour, B drives 5 hours. How many kilometers is the distance between AB and ab?
AB distance = (4.5 × 5) / (5 / 11) = 49.5km
2. A passenger car and a freight car leave each other from a and B at the same time. The speed of the freight car is four fifths of that of the passenger car. After a quarter of the whole journey, the freight car runs 28 kilometers to meet the passenger car. How many kilometers are there between a and B?
The speed ratio of passenger cars and freight cars is 5:4
Then the distance ratio of meeting is 5:4
4 / 9 of the whole journey of freight cars when they meet
At this time, the freight car has traveled 1 / 4 of the whole journey
4 / 9-1 / 4 = 7 / 36 from the meeting point
Then the whole journey = 28 / (7 / 36) = 144 km
3. Party A and Party B travel around the city. Party A travels 8 kilometers per hour and Party B travels 6 kilometers per hour. Now they start from the same place at the same time. After meeting Party A, Party B travels 4 hours to return to the original starting point?
A / b speed ratio = 8:6 = 4:3
When we met, B made 3 / 7 of the whole journey
So 4 hours is 4 / 7 of the whole journey
So the time of a week in line B = 4 / (4 / 7) = 7 hours
4. Party A and Party B walk from place a to place B at the same time. When Party A walks 1 / 4 of the whole journey, Party B is 640 meters away from place B. when Party A walks the remaining 5 / 6, Party B walks 7 / 10 of the whole journey. What is the distance between two places?
The remaining 1-1 / 4 is 3 / 4
So the remaining 5 / 6 is 3 / 4 × 5 / 6 = 5 / 8
At this time, a total of 1 / 4 + 5 / 8 = 7 / 8
Then the distance ratio of Party A and Party B is 7 / 8:7 / 10 = 5:4
So when a takes 1 / 4 of the whole journey, B takes 1 / 4 × 4 / 5 of the whole journey = 1 / 5
Then AB distance = 640 / (1-1 / 5) = 800 meters
5. Car a and car B leave from a and B at the same time, facing each other. Car a travels 75 kilometers per hour, while car B takes 7 hours to complete the whole journey. After 3 hours, the distance between the two cars is 15 kilometers. How many kilometers is the distance between a and B?
One situation: Party A and Party B have not met yet
Car B runs 3 / 7 of the whole journey in 3 hours
A 3-hour travel 75 × 3 = 225 km
AB distance = (225 + 15) / (1-3 / 7) = 240 / (4 / 7) = 420 km
One situation: Party A and Party B have met
(225-15) / (1-3 / 7) = 210 / (4 / 7) = 367.5km
6. A, two people have to finish the road. A has to walk 30 minutes, and has to walk 20 minutes. After 3 minutes, a finds that he hasn't taken something, and it's delayed for 3 minutes. How many minutes will he walk with him?
A starts 3 + 3 + 3 = 9 minutes later than B
Consider the whole distance as unit 1
So the velocity of a is 1 / 30
Speed of B = 1 / 20
When a finished taking things and set out, B had already gone 1 / 20 × 9 = 9 / 20
Then the distance between a and B is 1-9 / 20 = 11 / 20
The speed sum of a and B = 1 / 20 + 1 / 30 = 1 / 12
Then (11 / 20) / (1 / 12) = 6.6 minutes
7. Car a and car B start from place a and travel in the same direction. Car a travels 36 kilometers per hour and car B 48 kilometers per hour. If car a starts 2 hours earlier than car B, how long does it take car B to catch up with car a?
Distance difference = 36 × 2 = 72 km
Speed difference = 48-36 = 12 km / h
It takes car B 72 / 12 = 6 hours to catch up with car a
8. Party A and Party B set out at the same time from AB, which is 36 km away. When party a set out from a to 1 km away, he found that there was an article in a, so he immediately returned. When he went to the article, he immediately returned