(online, etc.) according to the rule of number arrangement in the figure, what is the row and number of 2009? First line 1 Second line 2 3 The third line 4 5 6 The fourth line 7 8 9 10 …… And so on. According to the rule of number arrangement in the figure, what is the row and number of 2009?

(online, etc.) according to the rule of number arrangement in the figure, what is the row and number of 2009? First line 1 Second line 2 3 The third line 4 5 6 The fourth line 7 8 9 10 …… And so on. According to the rule of number arrangement in the figure, what is the row and number of 2009?

First line 1 / 1
Second line 1 / 2 1 / 2
The third line 1 / 3 1 / 6 1 / 3
The fourth line 1 / 4 1 / 12 1 / 12 1 / 4
The fifth line 1 / 5 1 / 20 1 / 30 1 / 20 1 / 5
The sixth line 1 / 6 1 / 30 1 / 42 1 / 42 1 / 30 1 / 6

Cut a 4-meter-long cylindrical steel into two equal sections. The surface area increases by 0.25 square decimeter, and each cubic decimeter weighs 7.8 kg. How much does it weigh

Bottom area: 0.25/2 = 0.125 square decimeter
Height 4m = 40m
Weight 0.125 * 40 * 7.8 = 39kg

People's education press eighth grade English volume 1 unit 1, 2, 3, 4 each sum up 25 sentences 50 phrases
It's from pep

Only give 1 unit, I type it out word by word, fake the death of the whole family~
Unit 1:
Key sentence patterns:
What do you usually do on weekends?
I often go to the movies / watch TV / shop /exercise / read.
How often do you shop?
I shop once a month / once a week / twice a year / everyday.
How often does your sister watch TV?
She watch TV everyday .
How often do you drink milk?
I drink milk everyday.
Key phrases:
Every day once a week twice a week three times a week once a month
Twice a month once or twice a week three or four times a week
All students most students some students no students pretty healthy
Eat vegetables do exercise eat junk food drink coffee very unhealthy
How often
Key words:
Exercise hardly ever once twice time internet program

There are 160 red, yellow and white balls. If you take out 13 red balls, 14 yellow balls and 15 white balls, there are 120 left. If you take out 15 red balls, 14 yellow balls and 13 white balls, there are 116 left. How many red, yellow and white balls are there?

According to the above analysis, take 160 ／ 40 = 4 times just finished, red ball is still poor: 43-1 = 13, white ball is more than 1-45 = 15, yellow ball is finished; it shows that 13 of red ball is equal to 15 of white ball, the ratio of red ball and white ball is 3:5; according to the comparison of two schemes, it is found that 13-15 = 215 of white ball is more than 215 of red ball by 4

How many feet, how many inches, how many feet, how many inches is the height of 1.90 meters?

It's 6 feet 2 inches, 1 foot = 12 inches = 30.48 cm

Primary school mathematics problem: the sum of two numbers is 340 more than the first and 260 more than the second. What is the sum of these two numbers?

340+260=600
The sum of these two numbers is 600
More than the first is the size of the second number, more than the second is the size of the first number

The difference between a and B is 9. One sixth of a is equal to one fourth of B. what is a and B?

1 / 6 a = 1 / 4 B
A: B = 3:2
Let a be 3x and B be 2x
3x-2x=9
x=9
3x = 3 * 9 = 27 A
2X = 2 * 9 = 18 B

The conversion relationship between LNG and diesel oil, heavy oil, gasoline and coal, such as how many cubic meters of LNG is one ton of diesel oil equal to

The intermediate value of conversion is standard coal or calorific value. For example, the heat released by 1kg standard coal combustion is 7000K cal, and that of crude oil is 10000K cal. Therefore, 1kg crude oil is equivalent to 1.4kg standard coal, diesel oil is equivalent to 1.45kg standard coal, and natural gas is equivalent to 1.33kg standard coal. Then, 1kg diesel oil is equivalent to 1.45 / 1.33 = 1.09Kg natural gas

First, second, fill in the blanks 10, third, calculation (rational number 1, solving equation 2, simplifying in solving problem 1, seeking angle 1), fourth, drawing problem 2, algebraic equation 2, fifth, geometry fill in the blanks judge and explain the reason

The opposite number of (2011 &; Zhanjiang) - 5 is () A. - 5b.5c. - 152. (2011 &; Yiwu) - 3 is () a.3b. - 3c.13d. - 13}}}}}}}} {}}} {}}} {}}} {}}}} {}}}}}} {}}}} {}} {}}}} {}}}}}}}} {

Calculation process of 7 / 8 △ [(3 / 4-1 / 2) / / 4 / 5]
The process and result of 7 / 8 △ [(3 / 4-1 / 2) ∶ 4 / 5]
Another question:
24 points: 11 out of 12 (calculate the ratio)

7 / 8 △ [(3 / 4-1 / 2) / / 4 / 5]
=7 / 8 ^ [1 / 4 ^ 4 / 5]
=7 / 8 ÷ 5 / 16
=14 out of 5
=2.8
24 points: 11 out of 12 = 24 points: 55 points = 24 out of 55