Help me solve a few math problems, help me solve a few math problems

I answered all three questions, and the first question was a bit long.

2) Solution: Let the number of A be x, then the number of B is 1 10x

x+1/10x=264

x=240Answer: The number A is 240, and the number B is 24

3) Solution: If the oil weighs x kilograms, the barrel weighs (kilograms.

x=6A: The oil weighs 6 kilograms, and the barrels weigh kilograms.

2.Let B be x and A 10x

x+10x=264

x=2410x=240

A 240, B 24

3.Set oil x kg.

6 kg of oil, kilogram of barrels.

Think about the first question.

Pure hand hit, do not copy, thank you ha).

2.A 240, B 24

Let A be 10x B be x

10x+x=264

3.Set the barrel weight xkg, oil weight ykg

x+y=x+solution gives x=,y=6

Answer:..

2 A:240 B:24

3. The oil weighs 6 kg and the barrel weighs kg.

2 A:240; B: 24;

3 Oil: 6 kg; Barrels: kilograms.

1. The same cloth, the number of sets of clothes that can be made is inversely proportional to the cloth required for a set of clothes, and there are: x solutions.

x=6902、

x:60+x:80=70

Solution: x=24003, suppose the price of the robe is x rubles, 12+x): 12=(5+x): 7

60+12x=84+7x

5x=24x=

1.Let the purchase price be x

x＜150-x＜

x 125, so the value range of the purchase price x is.

125＜x＜136

2.Set tension x pages per day.

98/x>7

98/(x+3)<7

That is, 77<7x<98

So the average tension reads 12 or 13 pages a day.

3.One dose should be in 15--40 mg.

4.Solution: Each team used to produce x products per day.

According to the title, you can get 3*10x<500

3*10（x+1）>500

The solution is 15 and 2/3 = 35

6x>=45

Because x is an integer, x=8

19. Set the purchase price x yuan, then you can get (10%+1)*x<=150, (20%+1)* x<=150, the value range of x can be obtained by solving the inequality group is 12598, the solution inequality group gets: 1160, the solution inequality group can get 15500, the solution inequality group gets: 47 335, the solution x>45 6, and the rounding is x=8, that is, at least 8 times.

If eight years ago, age B was x, then A was.

Now A ( years old, B is x+8

Solve the equation x=4 then A is this year old.

Set: A is x years old this year. Solution: x multiply both sides to get:

x = 18 years old.

Check: A 18-8 = 10 10 years old (B 8 years ago); 4+8=12 years old (B this year) 18.

A: A is 18 years old.

She is x years old this year.

x = 16 A is this year old.

Let B's age 8 years ago be x, and A's 8 years ago be y

y=y+8=

The simultaneous equation is solved x=4 y=10, so A is y+8=18 years old this year.

xiamingzhe2, hello:

Solution: Let's say B is x years old this year, and A is this year.

x 12 A this year:

12 years old).

1. Sunny day a, rainy day b = 2 3*a, cloudy day c = 2 5*aa + b + c = 1 + 2 3 + 2 5) a = 31 15*a

This month is 31 days to do Yu Xiao, so a = 15 days of pure draft.

The calendar states that the month of July is 31 days.

2. The blue cloth has x meters, so the flower cloth is 3 2x meters, and it can be seen from the question that the white cloth is 5 4x meters.

So 3 2x+x+5 4x=1380

The destroyed faction is x=368

So the flower cloth 552 meters.

Blue cloth 368 meters.

White cloth 460 meters.

12-9 = 3 kg.

60*8*5 7=30 7=4 and 2 7

1.July is big, of course it's 31 days.

2.The flower cloth is 3/2 of the blue cloth, then it can be seen that their ratio is 3:2, since this is the case, it is good to forget the Hui Potato, you can combine the two ratios together, 3:

2 equals 6:4, and 5:6 is the same as 6:

4 can be combined together, which is equal to 5:6:4, and after the comparison of Zhidan Xiangdao, it will be distributed proportionally.

The equation is: 3:2=6:

4 5 6 4 = 15 1380 15 = 92 (m)

92 5 = white 92 6 = flower 92 4 = blue 53Divide 15 by 5 and see how much it is, subtract 3 from 4 and see how many copies are less, and then take 15 5 quotient and multiply it by 4 to 3 more, and B is less than C. The equation is:

2. White: 460 meters Flower: 552 meters Xiaoye Chong Blue: 368 meters 3, is this question much less? 3 kg.

4. The ridge of number C is 2 of number B and 5 of hit

7 hectares.

1. Set up a stationery store to sell a total of x sets of this electronic dictionary.

15 4 5x + (15-3) (1-4 5) x 864, solution x 60

(1 9 + 1 12) = 36 7 hours = 5 and 1 7 (1 9 + 1 12) 1 7 = 1 36

5 2 + 1 4 10 and 1 4 hours.

(1 10 + 1 12 + 1 15) 8 days.

C helped A repair (1-1, 10, 8), 1 15, 3 days (220-60).

(1+50) 1+20) 160 yuan200 (1+100) 1+20 ) 120 yuan should be priced in the range of 120-160 yuan.

6. The first storage method.

The principal and after-tax interest in the first year are 1000+1000 yuan, and the principal and after-tax interest in the second year are total: yuan.

The second method of storage.

The principal and after-tax interest due in two years are 1000+1000 yuan, which shows that the after-tax interest obtained by the second storage method is more.

1. The sports track is composed of two straight tracks and two semicircular tracks, both of which are lawns in the middle, and the circumference of the runway: 100 2 20 meters;

Lawn area: 100 20 10 square meters!

2. Solution: The key to this problem is to consider the area of carpet paving from two aspects.

First of all, when viewed from above, the place where the carpet can be spread is a rectangle, long and wide. The area of the rectangle is: . Secondly, when viewed from the side, the place where the carpet can be spread is also a rectangle, long and wide.

The area of the rectangle is: . The required carpet area is:

The required fee is: RMB).

Happy learning!

100*2+ meters.

Lawn area. 20 2 = 10 meters.

2314 square meters.

2. The conditions are not complete.

100*2+ meters.

Lawn area. 20 2 = 10 meters.

2314 square meters.

The missing condition for the second question is: the height of the stairs.

I don't know the final answer, it may be 820!

Correct answer: Ran the number of meters, 100*2+20*, area: 100*20+10 10* Calculate the answer yourself 2 questions I don't understand, the bottom of the stairs? It should be high.

243 = 3 under the fifth root number, because 3 3 3 3 3 = 243

4x²-4x+1)=√(2x-1)²=±(2x-1)

So (4x -4x+1)=2x-1 or (4x -4x+1)=-2x+1

Solution: Factoring 243 to 243 = 3 3 3 3 3, so 243 under the fifth root number is equal to 3