I know that there is a formula for Kepler's third law. Is there a formula for Kepler's first law and Kepler's second law?

I know that there is a formula for Kepler's third law. Is there a formula for Kepler's first law and Kepler's second law?

Kepler's first law, also known as the law of ellipse; also known as the law of orbit: each planet along its own path
The second law of Kepler, also known as the law of area: in equal time, the area swept by the line (vector radius) between the sun and the planets in motion is equal. This law actually reveals the conservation of angular momentum of the planets around the sun

On the proof of Kepler's second law and universal law formula
Such as the title

Mg = g (mm / r2), but you seem to have some questions

The expression of Kepler's third law
There's nothing else, just its expression

r3/t2=R3/T2

A math problem I really don't understand
1,5,9,16,(),36

1,5,9,16,(25),36

I don't understand several math problems
1、 Fill in the blanks
1. 20% of boys in a school is equal to one third of girls, girls are less than boys ()
2.3 percentage points is ()%
3. () increase it by 20% to 6; () decrease it by 20% to 72
4. If a commodity is sold at 95 yuan, it will lose money% and make a profit of 15%, it should be sold at () yuan
5.12 m is 20% less than () M
2、 Formula calculation
1.80 is 20% less than what?
2. What is 390 after 30% increase?
3、 Practical questions
There was a batch of rice in the supermarket, which sold 20% on the first day and 25% on the second day
If there are 165 kilograms left after two days of selling, how many kilograms are there in this batch of rice?
The fourth part of the question is 5% loss

2.3 percentage points is (3)%. 3. (5) increase it by 20% is 6; (90) decrease it by 20% is 72.4. If a commodity is sold at 95 yuan, it will lose money%, if it will make 15% profit, it should be marked price

A few math problems, do not understand, please help master?
1. Four fifths square decimeter = () square centimeter
2. Eight tenths of square kilometers = () hectares
3. Thirty percent square meter = () square decimeter
4. Twenty one tenths square decimeter = () square centimeter
You'll get extra points if you get it right

1. Four fifths square decimeter = (80) square centimeter
2. 8 / 10 square kilometers = (80) hectares
3. Thirty percent square meter = (30) square decimeter
4. Twenty one tenths square decimeter = (210) square centimeter

1： Define the operation with "[": for any rational number a, B, there is a [=_____
2： Integers with absolute values less than 4 have ()
A: 4
B: 5
C: 6
D: 7
3： Mr. Zhang bought 1000 shares of a company last week at 27 yuan per share. The following is the daily rise and fall of the stock this week
Monday, Tuesday, Wednesday, Thursday, Friday
+4 +4.5 -1 -2.5 -6
It is known that Mr. Zhang paid 1.5% of the commission when he bought the shares and 1.5% of the turnover and 3% of the transaction tax when he sold them. If Mr. Zhang sold all the shares before Friday's closing, how about his earnings?

1. [- 5] (- 9) = - 2) ^ 2 + (- 9) = - 5 2. [D] 7: positive and negative 1, positive and negative 2, positive and negative 3 and 03 respectively. [lost 162 yuan] the share price on Friday is 27 + 4 + 4.5-1-2.5-6 = 27 yuan. Mr. Zhang's earnings are selling share price minus buying share price minus handling charges and transaction tax, namely 1000 * 27-1000 *

I don't understand a few math problems. I'm looking for a master
Transfer two seventh of the grain in warehouse A to warehouse B. the grain in the two warehouses is equal. The grain in warehouse A is the grain in warehouse B ()
If the number of male workers in a workshop is 75% of that of female workers, the number of workers in the whole workshop may be () A.30 b.40 c.56
0.12 is 0.1 less than 2% of a number. What is the number?

1. Transfer two seventh of the grain in warehouse A to warehouse B. the grain in the two warehouses is equal. The grain in warehouse A is the grain in warehouse B (7:3)
2. If the number of male workers in a workshop is 75% of that of female workers, the number of workers in the whole workshop may be (c) A.30 b.40 c.56
3.0.12 is 0.1 less than 2% of a number. What is the number?
(0.12+0.1)/2%=11

4 / 9 square decimeter = () square centimeter
Seven hundredth of a hectare = () square meters
73% ha = () m2

50,60,790000

A math problem I don't understand
The 6-meter-long rope is divided into 7 sections, each section is () meters long, and each section is full length (). There should be explanation, formula and answer, thank you

Total length / number of sections = 6 / 7 of each section = 6 / 7M
It is divided into several sections on average, which is a fraction of the total length. Seven sections are 1 / 7
You should have just finished the score. This problem is a score problem