Zhou Hong read a 540 page story book. On the first day, she read 1 / 6 of the whole book. On the first day, she read 5 / 6 of the next day

Zhou Hong read a 540 page story book. On the first day, she read 1 / 6 of the whole book. On the first day, she read 5 / 6 of the next day

The first day I saw:
540 × 1 / 6 = 90 (page)
The next day I saw:
90 △ 5 / 6 = 108 (page)
Comprehensive:
540×1/6÷5/6
=90÷5/6
=108 (page)

Is the ugly duckling the father of fairy tales

No. the first ugly duckling is not a human being. It can only be said that Andersen is the father of fairy tales to some extent. Of course, it's only in the eyes of those who admire him

All the fairy tales and the authors

Sleeping Beauty
Cinderella
Snow White
The daughter of the sea
The amazing little flying man
Beauty and beast
The emperor's new dress
Seven color deer
Avanti
Alibaba and the Forty Thieves
Disney's Aladdin
The adventures of puppets
There are a lot of fairy tales. If you want to see fairy tales, go to Green's fairy tales, Andersen's fairy tales, one thousand and one nights
It's a collection of fairy tales

Mathematics problem: what is the proportion of 3 tons to 7 / 2 tons? What is the proportion of 9 / 4 kilometers? What is the proportion of 3 / 4 kilometers? What is the proportion of 1 / 5 of 2 meters?
What percentage of 4:00 is 24 minutes? Xiao Ming plans to read 2 / 7 of a book every day and finish it in () days. If he wants to finish it one day in advance, he must read it every day on average（

602284094,
What's the proportion of three tons to seven out of two tons?
3÷7/2＝6/7
What percentage of 9 / 4 km is 3 / 4 km?
3/4÷9/4＝1/3
How many meters is 1 / 5 of 2 meters?
2 × 1 / 5 = 2 / 5 (m)
What's the percentage of 4:00 is 24 minutes?
24÷（4×60）＝1/10
Xiao Ming plans to read 2 / 7 of a book every day and finish it in 7 / 2 days;
1÷2/7＝7/2
If you want to watch it one day in advance, you have to watch it every day on average (2 / 5)
1÷（7/2－1）＝2/5

Given the function f (x) = 4 ^ X / 4 ^ x + 2, find f (a) + F (1-A), find f (1 / 100) + F (2 / 100) +. F (99 / 100)
And the first and second questions all need answers
It should be f (x) = 4 ^ X / (4 ^ x = 2)

(1) F (x) = 2 ^ 2x / (2 ^ 2x + 2) = 2 ^ (2x-1) / (2 ^ (2x-1) + 1) take x = a, x = 1-A into f (x) respectively to get f (a) = 2 ^ (2a-1) / (2 ^ (2a-1) + 1) f (1-A) = 2 ^ (1-2a) / (2 ^ (1-2a) + 1) numerator denominator multiplied by 2 ^ (2a-1), because 2 ^ (2a-1) > 0, f (1-A) = 1 / (2 ^ (2a-1) + 1

Binary linear equations (19 20:31:58)
A sports lottery dealer plans to use 45000 yuan to buy 20 bars of lottery tickets from the provincial sports lottery center, with 1000 tickets for each bar. The sports lottery center has three different prices of lottery tickets a, B and C, with the purchase price of 1.5 yuan for each a lottery ticket, 2 yuan for each B lottery ticket and 2.5 yuan for each C lottery ticket
(1) If the dealer buys 20 bars of two different types of lottery tickets at the same time, it will cost 45000 yuan. Please design the ticket scheme:
(2) If you sell a lottery ticket of type A or the handling charge is 0.2 yuan, a lottery ticket of type B or the handling charge is 0.3 yuan, and a lottery ticket of type C or the handling charge is 0.5 yuan?
(3) If the dealer plans to buy 20 lots of a, B and C lottery tickets with 45000 yuan, please design the ticket scheme

(1) There are two schemes: one, 5 ties a and 15 ties C. two, 10 ties B and 10 ties C
(2) Choose the first one and calculate it
(3) There were four schemes: one, four a, two B and fourteen C. two, three a, four B and thirteen C. three, two a, six B and twelve C. four, one a, eight B and eleven C

The result of sin43 ° cos13 ° and sin47 ° cos103 ° is equal to ()
A. 12B. 33C. 22D. 32

Sin43 ° cos13 ° + sin47 ° cos103 ° = sin43 ° cos13 ° + sin (90 ° - 43 °) cos (90 ° + 13 °) = sin43 ° cos13 ° - cos43 ° sin13 ° = sin (43 ° - 13 °) = sin30 ° = 12

What are the expressions of acceleration a

X=V0t+0.5t2
V=V0+at

11. On the equation of 5x-2m = - 4-x, the solution x satisfies 2

c

Given √ (25-x & # 178;) - √ (15-x & # 178;) = 2, then √ (25-x & # 178;) + √ (15-x & # 178;) ask for the help of all gods!

[√（25-x²）-√（15-x²）][√（25-x²）+√（15-x²）]=(25-x²)-(15-x²)=10
So) 2 [√ (25-x & # 178;) + √ (15-x & # 178;)] = 10
[√（25-x²）+√（15-x²）]=5