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January February March April May June July August September October November December

January
February February
March March
April April April
May
June June
July, July
August
September September September
October October
NovemberNovember
December December

English translation
Don't simplify the form

January February,march,April,may,June, July.August September October November December

On the number axis, points a and B represent rational numbers a and B respectively. If the origin is just the midpoint of AB, then 2009 × ab=______ ．

The origin is just the midpoint of AB, a and B are opposite numbers, ab = - 12009 × AB = - 2009, so the answer is: - 2009

30 points for several primary school proportion math problems, thank you!
1. Given that 13 parts x = 5 parts y, what is the ratio between X and y?
2. Given 5: x = Y: 3, what is the ratio of X to y?
3. Given x + y = 5, what is the ratio of X to y?
4. There are 400 grams of salt water, in which the ratio of salt to water is 1:9. How many grams of water are needed to make the ratio of salt to water 1:19?
5. A road construction team plans to build a road in April. In the first ten days, it built one fifth of the road. In the middle ten days, it built 70 meters more than in the first ten days. At this time, the ratio of the number of meters to the number of meters not built is 3:1. How many meters is the road?
6. A bottle of nutritional products weighing 22 grams, in which the weight ratio of sugar and milk powder is 2:3, the weight ratio of milk powder and cocoa is 6:1, what are the weight of milk powder, sugar and cocoa?
It's better to finish answering the questions. I'll send more points. Thank you!
Back to longwenhai 1725: I haven't learned it. We just learned it, but we still don't understand it^_^
Wait for answers online~~

1. X is proportional to y
2. X is inversely proportional to y
3. X is out of proportion to y
4. 400 × 1 / (1 + 9) △ 1 / (1 + 19) - 400 = 400 (g)
5. 70 ÷ [3 / (3 + 1) - 1 / 5 × 2] = 200 (m)
6. Sugar: milk powder = 2:3, milk powder: cocoa = 6:1
Sugar: milk powder: cocoa = 4:6:1 4 + 6 + 1 = 11
Sugar: 22 × 4 / 11 = 8 (g)
Milk powder: 22 × 6 / 11 = 12 (g)
Cocoa: 22 × 1 / 11 = 2 (g)

Can you play 24 o'clock? Please use the mixed operation of rational numbers in the seven numbers of "2, - 3,4, - 5,6,12, - 8" to make the result of the four numbers 24

Simple, choose 12,6, - 5, - 8
(12-4)[-5-(-8)]=24

One half and one sixth and one twelfth and one twentieth
What did you find?

One half and one sixth and one twelfth and one twentieth
=1-1/2+1/2-1/3+1/3_ 1/4+1/4-1/5
=1-1/5
=4/5
To adopt the correct answer first is to respect the labor of the respondent

If the system of inequalities 7x-m ≥ 0,6x-n < 0 for X has only 1,2,3 integer solutions, then how many pairs of integers (m.n) are suitable for this system of inequalities?

From 7x-m ≥ 0 to X ≥ M / 7, from 6x-n

How to draw the height of a triangle and how to calculate its area

A batch of cement was delivered to the construction site. After 1 / 4 of the cement was used, the remaining cement was put into two warehouses (A and b) according to the ratio of 2:3. It is known that 24 tons were put into warehouse a
How many tons of cement have you got

Total a = (1-1 / 4) / (2 + 3) × 2 = 3 / 10
Total = 24 △ 3 / 10 = 80 tons

The bottom diameter of a cylinder is 2 decimeters, the surface area is 12.56 square decimeters, and the height of the cylinder is______ Decimeter

Bottom area: 3.14 × (2 △ 2) 2 = 3.14 (square decimeter), side area: 12.56-2 × 3.14 = 6.28 (square decimeter), height: 6.28 △ 2.14 × 1, = 6.28 △ 6.28, = 1 (decimeter); answer: the height of the cylinder is 1 decimeter