(1) The number of students in class 61 is between 40 and 50. The number of girls is one fifth more than that of boys (2) The afforestation area of a township this year is 40 hectares, 8 hectares more than that of last year. How many percent more than that of last year? (3) There are 2000 chickens and a quarter of ducks in the farm. How many chickens and ducks are there in the farm? (4) It is predicted that the output of cars in China will reach 1.08 million this year, an increase of 80% over last year? (5) Xiao Gang read a 360 page story book. On the first day, he read one tenth of the whole book. On the second day, he read three twentieth of the whole book? (6) The production of a batch of parts can be completed in 6 hours with the cooperation of master and apprentice. If the master does it alone, it will take 4 hours more. If the apprentice does it alone, how many hours will it take to complete it? (7) A car from a to B, when driving to five eighths of the whole journey, has left the midpoint of the two places 30 kilometers. How long is the highway between a and B? (8) A total of 16 copies of one hundred thousand whys, each of which costs 10 yuan. During June 1, a and B bookstores sold the series, but they adopted different promotion methods. Bookstore a: 20% off for one set; Bookstore B: 2 copies for one free. If you want to buy a set of one hundred thousand whys for primary school students, please help figure out which bookstore is cheaper (1) Only the answers to the questions are given,

(2) From the title: last year, 32 hectares (40-32) △ 32 = 25%
(3) 1 / 4 × 2000 = 500
(4) Suppose last year's x 10000 (1 + 80%) x = 108, the solution is x = 60. Answer: last year's output was 600000
（5）360-（360×1/10）-（360×3/20）=270
Start at 270
(6) 1 △ 6 = 1 / 6 (the master and apprentice do it every day)
Five days for the master and three days for the apprentice can be regarded as three days for the master and three days for the apprentice, and two more days for the master
1/6X3=1/2
7/10-1/2=1/5
This is what the master did for two days
1/5÷2=1/10
1 △ 1 / 10 = 10 days
It takes 10 days for each master to make this batch of parts individually
1/6-1/10=1/15
1 / 15 = 15 days
It will take 15 days for each student to make this batch of parts alone
(7) It can be seen from the question that the key point of the distance between a and B is 4 / 8. When driving 5 / 8, it is 30km away from the midpoint
∴（5/8-4/8）=30 30×8=240km
A: the highway is 240km long
(8) Shop a: 16 × 10 × 80% = 128 yuan
Shop B: it is known that if you buy 2 copies, you will get one free. If you buy 3 copies at a time, you will get 18 copies at least 6 times. 12 × 10 = 120
The second store is cheap (uncertain)

There are several students in class 61. There are 18 students in one half of boys and one third of girls. There are 17 students in one third of boys and one half of girls,
There are several students in class 61, 18 of them are boys and 1 / 3 of them are girls, and 17 of them are boys and 1 / 3 of them are girls. How many boys and girls are there in this class?

Hello
Boys × 1 / 2 + girls × 1 / 3 = 18
Boys × 1 / 3 + girls × 1 / 2 = 17
By adding the above two formulas, we can get the following result:
Boys × (1 / 2 + 1 / 3) + girls × (1 / 3 + 1 / 2) = 18 + 17
Boys × 5 / 6 + girls × 5 / 6 = 35
(male + female) × 5 / 6 = 35
So,
Male + Female = 35 △ 5 / 6 = 35 × 6 / 5 = 42 (person)

Light year is the unit used to express the distance between celestial bodies in astronomy. One light year is equal to the distance that light travels through in vacuum for one year. Please calculate that one light year is equal to one year
How many meters, expressed by scientific notation, accurate 0.01. (the speed of light in vacuum is 300000 kilometers per second, 365 days in a year)

1 (light years) * 365 (days) * 24 (hours) * 60 (minutes) * 60 (seconds) * 30 * 10000 * 1000m = 94608000000000000m = 9.46 * 10 ^ 14m

The approximate value of PI is It is And__ The ratio of the two

According to the meaning of PI, the approximate value of PI is 3.14, which is the ratio of the circumference of a circle and its diameter; so the answer is 3.14, the circumference of a circle and its diameter

Let the side length of the upper and lower sides of a regular triangular platform be 2cm and 5cm respectively, and the side edge length be 5cm

If we draw a regular triangular pyramid, connect the center of the upper and lower bottom surfaces, CC1, connect AC, BC, then AC = 533-233 = 3, ab = 5, ｜ BC = oo1 = AB2 − ac2 = 22, that is, the height of the pyramid is 22cm

If f (x) = 1 and G (x) = x are equal to the power 0, explain the reason

It is not equal because g (x) = x to the power of 0 if x cannot be equal to 0

It is known that ABC is an integer. For any integer x, the value of the algebraic expression ax & # 178; + BX + C can be divisible by 3. It is proved that ABC can be divisible by 27

For any integer x, the value of the algebraic expression ax & # 178; + BX + C can be divisible by 3, so ax & # 178; + BX + C = 3 (a1x ^ 2 + b1x + C1), then a = 3A1, B = 3b1, C = 3c1, ABC = 27a1b1c1, so ABC can be divisible by 27

The shortest distance from point to focus on ellipse
Which point on the ellipse is the shortest distance from the focus? The endpoint of the major axis or the endpoint of the minor axis?

It's the end of the long axis on the same side, of course

The product of the reciprocal of two prime numbers is 1 / 65. What is the sum of their reciprocal

Factorization 65 = 5 * 13. So it's easy to get these two prime numbers 5,13. Then, we can get the sum of their reciprocal: 1 / 5 + 1 / 13 = 18 / 65lz. In this case, it's very easy to decompose the factor. It's too troublesome to think about how to calculate it with algebraic formula. Moreover, we need to make up numbers with algebraic formula

Given that the function f (x) is equal to the absolute value of LG (x), if a is not equal to B and f (a) = f (b), what is the range of a + B

Then [LG (a)] ^ 2 = [LG (b)] ^ 2 [LG (a)] ^ 2 - [LG (b)] ^ 2 = 0 [LG (a) + LG (b)] [LG (a) - LG (b)] = 0 ∵ A is not equal to B, and ∵ LG (a) - LG (b) is not 0 ∵ LG (a) + LG (b) = 0

The approximate value of PI is______ It is______ And______ The ratio of the two