Urgent!! Equation Questions!! To do it with a one dimensional equation!!

x-11800=(x/

Investment this year = investment last year*

x=16200

Equivalence This year times 110% - last year = last year times 135%.

Let last year's investment be x, then.

8000+x）（1+35%）—x(1+10%)=11800x=4000

Revenue = 11800 + 4000 (1 + 10%) = 16200

Solution: Suppose that air conditioner A after only increasing the temperature by 1 saves electricity by x1 kWh per day, and air conditioner B after increasing the temperature by 1 saves electricity by x2 kWh per day.

Then list the quadratic equations as follows:

x1-x2=27

The two equations of x1 + simultaneous can be solved to obtain x1 = 207 and x2 = 180 Answer: Air conditioner A can save 207 kWh of electricity per day by only raising the temperature by 1, and air conditioner B by raising the temperature by 1 can save 180 kWh of electricity per day

This should be very detailed, I wrote down the whole process, I hope it will help you.

After setting 20 days, x units will be sold every day, and the equation is: 32*10+20x=1000+1000*20% x=44 units.

Solution: (1) Set x kWh of electricity consumption in May.

50+x=150

2) Set the electricity consumption in April x kWh.

x=200

The monthly electricity consumption does not exceed 100 kWh, and the cost is 100*

1) Pay 70 yuan for electricity, more than 50, so if the electricity consumption exceeds 100, set it to x100*

x=150, then the user consumes 150 kWh of electricity in May.

2) The user's electricity consumption in April x kWh.

x = 200: The user's electricity consumption in April is 200 kWh.

Suppose the two copyists meet again at the starting point after T minutes of departure, at this time A has run n laps and B has run m laps. Rule.

400n = 350t

400m = 250t

n:m = 7:5 (this is already an approximate fraction).

So when the two meet at the starting point, A runs 7 laps and B runs 5 laps, then t=400*7 350 = 8 minutes.

The main equation is: because the speed ratio of A and B is 7:5, so the ratio of the number of laps to run when they meet again at the starting point is 5:7, then the two run a total of 12 laps, let the time t, and the equation is.

350t+250t=400*(5+7), then t = 8

Set the nth minute to meet at the runway departure point.

A ran 350 m and B ran 250 nm.

The sum of their journeys must be a plus integer multiple of 400.

So 600n is an integer multiple of 400.

The minimum n is 4 to find the common multiple of 400 and 600, divided by 600 is n

Very simply, the sum of the speed of the two is 350 + 250 = 600, then the sum of the distance of the two people in one minute is 600 meters, if the two meet at the starting point, the sum of the distance of the two is 400, then the distance is 400 meters, so the time is 400 600 = 2 3 minutes.

After X minutes, the two meet at the starting point, then the difference in the total length of the two people should be exactly one lap.

then 350x-250x=400x=4

Set T minutes after the two meet at the starting point, indicating that A and B have run an integer number of laps, so you might as well set A to run x laps and B to shoot Y.

By the time relationship 400x 350=400y 250x=

x=7,y=5t=8

1) After the lecture, the assignment will be cleared for five minutes.

3) After 20 minutes. y=-7t+380

4) When t=27, y=191

OK. As can be seen from the picture, from 5 minutes after the class to the 25 minutes after the class, the mu is sold to the tomb, and the relatives have been more than 190.

1。Assuming that the daily passenger volume of rail transit is x thousand person-times, then the daily traffic volume of ground buses = 4x-690,000 person-times, then there is a total daily traffic volume of x+4x-69=1696, that is, 5x-69=1696

The solution is x=3.53 million, so the daily passenger volume of rail transit is 10,000, and the daily traffic volume of ground buses is 4*353-69=13.43 million, 2(1) First of all, the unit price of the excess part is yuan per kilowatt-hour.

Then the equation can be listed as.

The solution is a=60

2) The average is yuan per kilowatt-hour< yuan per kilowatt-hour, indicating that the electricity consumption in June also exceeds a=60 degrees, so let's assume that the total electricity consumption in June is y kWh, then the total electricity bill should be.

The equations can be listed as follows:

24+solution gives y=90

Therefore, the total amount of electricity used in June is 90 kWh, and the electricity fee payable is yuan.

I hope you can see this explanation clearly!

1. Set up the average daily passenger volume of rail transit x;

then there is x+4x-69=1696;→5x=1627;then x = 10,000 person-times;

Average daily passenger volume of ground buses = 10,000 person-times; (I guess you made a mistake, it should be a total of 1669 or 960,000 less; If calculated according to 1669, then x = 320, if calculated according to 96, then x = 320, but the number of people on the ground is different)

2、a*；Launch; then a=60;

Set x kWh of electricity in June; [60*；

Launch; Launch; then x = 90 degrees.

90* yuan.

If the average daily passenger volume of rail transit is x thousand person-times, the average daily passenger volume of ground transportation is 4x-690,000 person-times.

x+4x-69=1696

5x=1765

x = 3.53 million person-times.

4x-69 = 13.43 million person-times.

1）a=60

2) Set up the household to share x kWh of electricity in June.

24+x=90 degrees.

1. If the average daily passenger volume of rail bus is x, then: the ground is 4x-69 according to the meaning of the topic: x+4x-69=1696, and the solution is x=353, that is, the average daily passenger volume of rail bus is 3.53 million people, and the average daily passenger volume of ground bus is 14.34 million people 2, (1) the solution is a = 60

2) Suppose the user used b kWh in June, because "so b>a (in the first step of a) is solved to b=90

That is, if the user used 90 kilowatt-hours of electricity in June, he should pay the electricity bill (the calculation process does not need to be written!) ）

The average daily passenger volume of ground buses is x, and the average daily passenger volume of rail transit is yx+y=1696,4y-x=69

x=353,y=1343

1) First, explain that a<84 is (84-a) degrees, then the equation is a*

a=602) because "Therefore, the household's electricity consumption in June is greater than 80 kWh, then the household will share x kWh of electricity in June.

x=9090*RMB).

Therefore, the household used 90 kWh of electricity in June and should pay the electricity bill.

Set the average daily passenger volume of rail transit x x + 4x-69 = 1696

2。Multiply by 70 percent.

The second question is no.

1。Set the track passenger volume is x million people, and the ground is 4x-694x-64+x=1696

5x=2600

x=520，

Set the average daily passenger volume of rail transit x x + 4x-69 = 1696

2。Multiply by 70 percent.

a=60

The sum of the absolute values is equal to 0, and the number in the absolute values is also equal to 0

2y-2=0 y=1

2x+5y+5=0 x= -5

So x+2y= -3

Such as satisfied.

It's simple. Both absolute values must be guaranteed to be 0 in order to satisfy the equation above. Therefore, x=-5 y=1So x+2y= -3

2x+5y+5=2y-2=0, i.e., y=1, and then x= -5 from the previous polynomial is substituted for x+2y= -3

Solution: The distance between the two docks is x kilometers.

x/32-x/38=8×2

x = 3242 and 2 3

A: The distance between the two piers is 3242 and 2 3 kilometers. 2.If x rice fabric is used for the blouse, then (600-x) is used for the pants x 3 2 = (600-x).

x=360 600-360=240

Answer: Use 360 meters of cloth to make tops and 240 meters of fabric to make bottoms.

Set the speed of the ship x38*(x-8)=32(x+8).

x=280/3

38*(x-8)=9728/3

Apply the core of this year x fabric peeling to make a change of clothes 2x 3 pants.

x+2x/3=600x=360