Elementary school simple equation knowledge

Algebraic expression of simple equation: letters or numbers connected by operation symbols (addition, subtraction, multiplication and division). Equation: an equation containing unknowns is called an equation. Column equation: two or more equal algebraic expressions are connected by an equal sign. Key problem of column equation: the same number is represented by more than two different algebraic expressions

RELATED INFORMATIONS

1. If the equation m minus 1 divided by x minus 1 minus x plus 2 divided by x minus 1 equals 0, then M equals 0
2. When n______ The equation (X-P) 2 + n = 0 has a solution______ ．
3. (254m-1011) divide by 375 to get the minimum M,
4. If x ^ 2 + 6x + K ^ 2 is exactly the square of an integer, then the value of the constant k is A 9 B 3 C -3 D + 3 or - 3 Why?
5. The following statement is correct: a all rational numbers have reciprocal; B all fractions are rational; C all decimals are rational; d all integers are positive
6. It is incorrect to say that 10 is neither positive nor negative. 2 the smallest integer is zero. 3 a rational number is either an integer or a fraction Rational numbers are divided into positive numbers, zero numbers and negative numbers
7. Ask some eighth grade math fractional equation questions I have a question in my book, which is (100 / x) = (30 / X-7) Multiply both sides of the equation by X (X-7) at the same time, and remove the denominator to get 100 (X-7) = 30x If we solve this integral equation, we get x = 10 Test: substituting x = 10 into x (X-7), we get 10 × (10-7) ≠ 0 Just tell me in this way! 1.(x+1/x-1)-(4/x²-1)=1 2.(4x/2x-1)=(2x+1/x-2) 3.(7/x²+x)-(3/x-x²)=1+(7-x²/x²-1) 4.(x-2/x+1)-(16/x²-4)=1 5.(2-x/3+x)-(1/2)=(1/x+3)
8. Simplify | 2x + 1 | - | x + 1 | to solve the equation | 2x + 1 | = | 5x + 7 | to find the minimum value of | x-3 | + | X-5 | + | X-7 | Please help the experts to answer, thank you very much!
9. X - three fifths x = eight ninths. How about x
10. It is known that A1, A2, A3, A4 and A5 are five different integers satisfying the condition a1 + A2 + a3 + A4 + A5 = 9. If B is the integer root of the equation (x-a1) (x-a2) (x-a3) (x-a4) (x-a5) = 2009 about X, then the value of B is______ ．
11. The sum of 4.5 times of Y and 0.5 times of Y is 20? The product of 20 and 5 is 99 times more than 10 times of X. how much is x? There are 365 pear trees and peach trees in the orchard. The number of peach trees is more than twice that of pear trees. How many pear trees and peach trees are there in the orchard? Fifth graders subscribe to 360 magazines, 60 less than three times the number of fourth graders. How many magazines do the two grades subscribe to? Party A and Party B have 90 science and technology books in total, and Party A's book is 3.5 times of that of Party B. how many science and technology books do Party A and Party B have? A has 82 more stamps than B, and a has three times as many as B. how many stamps does a and B have? The sum of divisor, divisor, quotient and remainder is 57, where quotient and remainder are 8 and 2 respectively. What is the divisor? Don't be wrong when you answer
12. Solving the equation of grade five in primary school The store shipped 400 kg of fruit candy and 240 kg of chocolate. After each sold the same amount, the fruit candy was 4.2 times that of chocolate. How many kg of fruit candy and chocolate do you want to sell?
13. The fifth grade of primary school equation, etc Somebody got 240 yuan There are three kinds of RMB, 2 yuan, 5 yuan and 10 yuan, a total of 50 pieces Among them, the number of 2 yuan and 5 yuan are the same How many pieces are there for 10 yuan? Express it in equation. Thank you. I'm teaching my niece. It doesn't matter if I'm old
14. 36 red balls and 24 yellow balls, the same size, are packed in the same kind of box, each kind of ball is just finished, how many can each box hold at most? How many boxes do you need?
15. Love to write a complete standard solution, thank you 1、 4 (20-x) = 24 2, 0.3 (0.4-x) = 0.12 3. (7 + x) / 4 = 15
16. 8x minus 8 times 3 equals 2x?
17. The product of 50% and 30 of a number is equal to the difference between the number and 28. Find the number (equation)
18. 30% of a number plus 21 equals itself. What's the number?
19. Try to contact examples in life, make up two practical problems, and list the corresponding binary linear equations
20. Given the equation 15 + x = 2 (6 + x), try to write an application problem, list the given equation and solve the equation