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Solution of linear equation with one variable The distance between station a and station B is 360 km. An express train departs from station B and runs 72 km per hour. A local train departs from station a and runs 48 km per hour. Question: if the two trains have to go wrong at the same station from the two cities, how many hours does the local train run earlier than the express train
It takes 360 / 72 = 5 hours for the express train to arrive at the same station between the two cities
48(x+5)=72*5
x=2.5
The local train starts 2.5 hours earlier
We need to solve the equation of first degree with one variable
To process 1500 parts, Party A needs 12h, and Party B needs 3H. If Party A makes 3H first, and then two people cooperate to complete the remaining parts, if the total reward is 600 yuan, how much can each person get
If the cooperation between two people needs XH to complete, then 125 * 3 + (125 + 500) * x = 1500, so x = 1.8, that is, the cooperation between two people needs 1.8 hours to complete, so a total of 3 + 1.8 = 4.8 hours, a total of 4.8 * 125 = 600, accounting for 1500, 600 / 1500 = 2 / 5
Several mathematical problems (equation of one variable and one degree)
1. If the purchase price of a commodity in a store is reduced by 8% and the selling price remains unchanged, the profit of the store can be increased by 10%. What's the original profit margin
2. A starts from a at 6:00 a.m. and arrives at B at 5:00 p.m. on foot. B starts from a at 10:00 a.m. and arrives at B at 3:00 p.m. on bicycle. When did B catch up with a?
1. Suppose: the purchase price is a yuan, and the original profit rate is X
a+ax=(1-8%)a+(1+10%)ax
Because a ≠ 0
According to the basic properties of the equation, multiply 1 / A on both sides
1+x=0.92+1.1x
X = 80%
Mathematics problem -- one variable one degree equation, ask for advice!
Lie equation
(1) There are 48 students in class 1 of Grade 7 in a school, among which the number of girls is more than four fifths of the number of boys. 3. How many boys are there in this class?
(2) The 1400 yuan scholarship is given to 22 students according to two kinds of awards, among which the first prize is 200 yuan per student and the second prize is 50 yuan per student. How many people have won the first prize?
(3) In the first half of this year, the per capita disposable income of residents in a town was 5109 yuan, an increase of 8.3% over the same period last year. How much yuan was this income in the same period last year?
(1) there are x boys and (4 / 5x + 3) girls in this class
x+(4/5x+3)=48
The solution is: x = 25
A: there are 25 boys in this class
(2) Suppose x people win the first prize, then (22-x) people win the second prize
200x+50（22-x）=1400
(3) Suppose the income of the same period last year is x yuan
x(1+8.3%)=5109
How to calculate 3 / 8 times 79 plus 3 / 8?
3 / 8 times (79 + 1) = 3 / 8 times 80 = 30
What idioms begin with words?
Find the rules and fill in the brackets: 4, 14, (), 21, (), ()
4、14、(9)、21、(16)、(28).
5X-(5674-453)=2x-34
5X-(5674-453)=2x-34
5x-5221=2x-34
5x-2x=5221-34
3x=5187
x=1729
I have a lovely fairy tale book
I have a favorite fairy tale book
It should be the word order
How much lower is the atmospheric pressure at 1000 meters above the ground
The average atmospheric pressure of 1km above sea level is 89.46 kPa, so it is about 11.87kpa lower
Altitude (km) / mean atmospheric pressure (kPa)
0km 101.33kPa
1km 89.46kPa
2km 79.06kPa
3km 69.86 kPa
4km 61.73kPa
5km 54.00kPa
20km 5.47kPa
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