There are 2 application questions in the first year of junior high school, which are easy to make up

1. If men's shoes are charged x million yuan in July, then women's shoes are 70-x million yuan x (1 + 60%) + 70-x (1 + 95%) = 126 to get x = 30

70-x=40

Therefore, in July, men's shoes were charged 300,000 yuan, and women's shoes were 400,000 yuan.

This should be the two teams A and B respectively set off from AB at 8 o'clock, with the speed of team B being X and team A being (3 2x+5).

So 2 (3 2x+5)+

Solution x=30

3/2x+5）=50

So team A is traveling at 50km/h and team B is 30km/h

Team A completed the entire amount of work in half an hour 1 24

Therefore, Team A should be able to complete the entire project independently in 12 hours.

If the title is to set up two teams to start together, it will take time.

1 (1 12 + 1 11) = 132 23 hours, but it is more likely that B arrives later than A as mentioned in the question.

1-1 24) (1 12 + 1 11) + hours.

1 Answer: The sales revenue of men's and women's leather shoes is x and y respectively

x+y=70

x=30 y=40

2 Answers:

In the August ** event, the selling price income of men's and women's leather shoes increased by 60% and 95% respectively compared with July, with an income of 700,000 yuan in July and 1.26 million yuan in August.

1) How much is the sales revenue of men's and women's leather shoes in July?

If the sales revenue of men's leather shoes in July is x, then the sales revenue of women's leather shoes is (70-x) million yuan.

x*(1+60%)+70-x)*(1+95%)=126x=30;

In July, the sales revenue of men's leather shoes was 300,000 yuan, and women's leather shoes were 400,000 yuan.

Sichuan ** landslide to block a lot of traffic, A, B 176km apart, during which a landslide caused by the connection of the two roads blocked, A, B two engineering teams received instructions, asked at 8 o'clock in the morning, to dredge, 10 o'clock, team A arrived immediately to start the operation, half an hour team B arrived, and team A to work together, at this time team A to complete the amount of 1 24

1).If the landslide damaged road is 1 km long, the speed of team A is more than 5 km 3 2 times the speed of team B, and the speed of team A and team B is obtained.

2).Assuming that it takes 11 hours to complete the task when only the road is dredged by Team B, how many hours does it take for the two teams to complete the road dredging task?

To add, there is a problem.

Categories: Teaching Nuclear Zen Education Academic Exam >> Study HelpProblem Description:

1. There are 3 teacups on the table with the rims facing up, and 2 cups are flipped each time, can they be flipped several times to make them turn all the cups down? What about 7 cups with the rim facing up, 3 flipped at a time? If "+1" and "1" are used to indicate different directions of the cup, can you use the operation of rational numbers to explain the reason?

2. In front of the 12 numbers on the clock face, add a positive or negative sign appropriately, so that their sum is 0 urgent, everyone help me, thank you, thank you.

Analysis: 1. There are 3 teacups on the table with the rim facing up, 2 of them are flipped each time, can they be flipped several times to make them all face down? What about 7 cups with the rim facing up, 3 flipped at a time?

If "+1" and "1" are used to indicate different directions of the cup, can you use the operation of rational numbers to explain the reason?

1. This is not feasible.

Remember that the cup is "+1" for Tong's hand upwards and "-1" for downwards

At the beginning, it is 1, and the three are 3, and two cups are flipped at a time, and there are several cases:

Two "1s" become two "-1s", and the value is reduced by 4

Two "1s" become two "1s" and the value increases by 4

A "1" and a "1" become a "1" and a "-1", and the value increases to 0, so no matter how you flip it, the sum of the values of the three cups divided by 4 is always the remainder of 3, which means that the value is only 3, 1, two possibilities, so it is impossible to flip them all over.

2. For the second case is possible, the cup situation is as follows:

Flip 4 times and you're good to go.

2. In front of the 12 numbers on the clock face, add a positive or negative sign appropriately, so that their sum is 0 and 0, only half of them need to be positive and half of them are negative.

1) 3, 4, 6, 7, 9, 10 are negative.

2) 8, 9, 10, 12 are negative.

3) 1, 8, 9, 10, 11 are negative.

Hello "1The total price of the first plan is: 4050*100*, and the total price of the second plan is: 4050*, so the first one is preferential.

2.(1) When the side length of the small square is x meters, the area of the white floor tiles is 5200 square meters.

The column equation is; 100*80-(80-2x)*x*2-(100-2x)x*2=5200, where 80-2x>x and x>0,0(2) can be obtained from the title: y={100*80-(80-2x)*x*2-(100-2x)x*2}*30+{(80-2x)*x*2+(100-2x)x*2}*20, simplified to y=80(x2-45x+3000) When x=meters, y is minimum, That is, the total cost is minimal.

Discount savings: yuan; Save 100* yuan in property fees. Option 1 Discount.

1) 1. B is 10% more expensive than A, and B** closure is.

b=a*(1+10%)=2409 yuan.

2. The power consumption difference between B and A is.

degrees are less than a per day).

Refer to 2, b to a above

365 days per year for 10 years to save electricity**p for.

p = degree * yuan degree * 365 days * 10 years = 657 yuan.

3. To sum up, B's **minus the **p saved in 10 years, that is: 2409-657 = 1752 yuan.

When A's ** is less than 1752 yuan, it can be used for 10 years or less, and A is cost-effective.

A's ** discount is 1752 divided by A's original price = 1752 Shen J 2190 = that is, A is 8% off or lower, and it is cost-effective if it is used for 10 years or within the sedan car.

Earn back the cost after the year.

That is, the fourth year begins to make a profit.

2) 32*15-120+20=3.8 million.

3,800,000 15 = 10,000 yuan.

The average annual profit in these 15 years is 10,000 yuan.

The velocity of the ship in still water and the velocity of the current in this channel are respectively 3(x+y)=48

4（x-y）=48

The solution is x=14 y=2

The speed of the ship in still water is xkm h, and the speed of the current is ykm hx+y=48 3

x-y=48/4

The solution is x=14 y=2

Solution: Let's say the growth rate of oil ** this month is x relative to the previous month. According to the title.

1＋x）（1－5％）=1＋14％

1＋x)×95％＝114％

x A: This month's oil** grew by 20 compared to the previous month

Comment: This question is a growth rate application problem. The cost of importing oil this month is equal to the previous month's cost plus the increased fee, which is the amount of oil imported this month multiplied by the current month's **.

Set the unknowns, represent each quantity, and list the equations to solve. The key to solving the problem of column equations is to find the relationship between the equal quantities, and then use the algebraic formula to express the quantities in it, and the column equation is solved.

It takes x days for team A to do it alone, and it takes y days for team B to do it, which is derived from the title.

1/x+1/y=1/24

20/x+40/y=1

Let 1 x=a; 1/y=b.The system of equations can be reduced to.

a+b=1/24①

20a+40b=1②

20 got. 20b=1/6,b=1/120

Substituting a=1 30 is y=