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In February of this year______ Days, all year round______ Yes, in February 2008______ Day
2013÷4=503… 1. There is a surplus, 2013 is a normal year, and the whole year has 365 days. 2008 △ 4 = 502, there is no surplus, 2008 is a leap year, February has 29 days, so the answer is: 28365, 29
Let the values of the unknowns of () on both sides of the two equations of the system of linear equations of two variables be the solutions of the system of linear equations of two variables
The values of the unknowns which make the left and right sides of the two equations (the values of the algebraic expressions) of the system of linear equations of two variables (equal) are the solutions of the system of linear equations of two variables
Quadratic equation of one variable: 1: integral includes (), (). 2: equation refers to the equation containing unknowns (). 3: the solution of the equation refers to the left and right of the equation
The value of () with equal values on both sides
One variable quadratic equation:
1: Integers include (monomials) and (polynomials)
2: An equation is (an equation) with unknowns
3: The solution of the equation refers to the value of the unknown which makes the values on the left and right sides of the equation equal
The term containing only one unknown number and the unknown number_____ Of_____ The equation is called quadratic equation of one variable
The highest number is 2
An equation with an unknown number and the highest exponent of the unknown number is 2 is called a univariate quadratic equation, such as: X & sup2; - 2x + 1 = 0. We record its general form as: ax & sup2; + BX + C = 0 (a, B, C denote known quantity, x is an unknown number, a is not equal to 0). Its solutions are: ① when B & sup2; - 4ac > 0, the equation has two unequal solutions; ② when B & sup2; - 4ac = 0, the equation has two unequal solutions, The equation has two equal solutions (i.e. one solution); ③ when B & sup2; - 4ac0
b²-4ac=0
b²-4ac
Ten minutes can solve the problem, but you have to send the answer to the Internet in ten minutes, which is a little difficult!
The first problem: the equation has two solutions, because B & sup2; - 4ac > 0
The second problem is that you take the formula of that solution to it and calculate it in the case of M, when m = m, when m is greater than 0 and when m is less than 0!
An equation with an unknown number and the highest exponent of the unknown number is 2 is called a univariate quadratic equation, such as: X & sup2; -- 2x + 1 = 0. It is known that the solution of the univariate quadratic equation AX & sup2; BX + C = 0 (a, B, C are known quantities, a ≠ 0) about X is: 1. When B & sup2; -- 4ac < 0, the equation has no solution
(1) How many solutions to the quadratic equation 2x & sup2; -- 4x + 5 = 0? Why?
(2) When a takes what value, there are two unequal solutions to the quadratic equation x & sup2; - 2x = (a -- 2) = 0
x²-2x+（a--2）=0
1、
aq=2,b=-4,c=5
b²-4ac=-240
4-4a+8>0
4a
With unknowns______ It's an equation
An equation with unknowns is an equation, so the answer is: an equation
With unknowns______ It's an equation
An equation with unknowns is an equation, so the answer is: an equation
Proportion with unknowns is also an equation
Wrong
Proportion with unknowns is also an equation? Judgment problem
Wrong
An equation with unknowns is an equation, but only the proportion is not enough. For example, X: 8 is not an equation, so we must emphasize the equation
RELATED INFORMATIONS
- 1. How many days are there in 2001 and 2008? How many days are there in February?
- 2. One column number: 3,6,8,8,4,2 From the third number, each number is a digit of the product of the first two numbers One column number: 3,6,8,8,4,2 From the third number, each number is a digit of the product of the first two numbers. Then the remainder of the number in this column divided by 3 is ()
- 3. The number of columns in order is given: 2 - 48 - 1632 The sixth and seventh numbers are () The number of columns in order is given: 2 - 48 - 1632 The sixth and seventh numbers are (the nth number is（
- 4. It is known that M minus 1 power of equation 4x plus 1 minus 2n power of equation 2Y is equal to 10, which is a binary linear equation about X and Y. how to find the value of M and N?
- 5. The binary linear equation 3x-2y = 1 is transformed into a linear function (). The intersection of the line and the X axis is () and the coordinate of the intersection of the line and the Y axis is ()
- 6. In the binary linear equation 5x-3y = 16, if x and y are opposite to each other, the solution of the equation is ()
- 7. Given that the absolute value of X + 8 and the absolute value of Y-2 / 5 are opposite to each other, what is the value of X + y
- 8. If the absolute value of a / a = - 1, then the value range of a is () A、a＜0 B、a≤0 Ca≥0 D、a＞0
- 9. If the absolute value of a minus 1 = 1 minus a, then the value range of a is
- 10. Art is beside me
- 11. How many days are there in February 1996? How many days are there in 1997? How many days are there in February 2008?
- 12. How many days are there before November 12, 2010 and June 7, 2011
- 13. English translation Attention! Use attributive clauses, and there are appositives in them Liu Xiang, from Shanghai, was born on July 13, 1983. He is 188CM TALL and weighs 74kg Mr. Zhang, an English teacher, was born on January 27, 1973. He is 173cm tall and has black hair My name is Li Chun, 18 years old, Chinese girl, living in No.40 Dongfeng Road, Guangzhou Jackie Chan, an excellent actor and director, was born on May 7, 1954. He is regarded as an Asian superstar Zhang Xiaoyue, 16, is studying in Shenzhen middle school. Her dream is to go to university Will adopt as soon as possible, do not computer translation, thank you very much
- 14. English translation Pay attention! Use attributive clause! As we all know, China has 9.6 million square kilometers of land and is the third largest country in the world There are 56 ethnic groups in China, of which the Han ethnic group accounts for 94% There are many big rivers in China, among which the Yangtze River and the Yellow River are the most important There was a time when China's economy lagged behind many countries in the world With the growth of economy, the days when Chinese people were discriminated are gone forever, so Chinese people are proud of it If you don't translate the computer, you will adopt it today
- 15. English translation 1. What a gorgeous mobile phone. I long for one on my birthday. When we stay in the country, we are used to swimming in the river. Cheer up, don't feel embarrassed because of low score, try hard next time. He is eager to master the method of improving his English What do you think is the way to improve your score? Now that you have passed your driving test, you can drive by yourself. Don't translate web pages. Use high school knowledge.
- 16. Calculation: 11 × 4 + 14 × 7 + 17 × 10 + +12005×2008．
- 17. If there is an integer greater than l, divide it by 300, 262 and 205 to get the same remainder
- 18. How many integers from 1 to 10000 have the sum of their digits equal to 5
- 19. Is the zero power of any number one?
- 20. The sum of the three numbers is 564. The three numbers can be divided by 3, 4 and 5 respectively, and the quotient is the same