The negative integer solution of inequality 2x-3 greater than or equal to 4x plus 5 is

The negative integer solution of inequality 2x-3 greater than or equal to 4x plus 5 is

Negative 4 negative 3 negative 2 negative 1
2x-3≥4x+5
-2x≥8
x≤-4
Because x is a negative integer
∴x=-1，-2，-3，-4
Application of quadratic equation of one variable
In order to fight against the once-in-a-hundred-year drought, a place in Southwest China invested 15 million yuan in February 2010 and 21.6 million yuan in April 2010. From February 2010 to April 2010, the average monthly growth rate of investment was the same. According to the plan, how many million yuan will be invested in May 2010?
According to the meaning of the question, students a and B listed part of the equation as follows:
х = [sup] 1 500
B: х - [] / 1500 = 2160 - х / х
(1) According to the equations given by students a and B, the meaning of the unknown х is as follows:
A:
B:
(2) Please complete the equations listed by students a and B in the box
(3) According to the plan, how many million yuan will be invested in the "drinking water project" in May 2010?
(1) A: average monthly growth rate
B: the investment in March
（2）2160 1500
(3) Calculation: 2592
To fight against the once-in-a-hundred-year drought, a certain place in Southwest China invested 15 million yuan in February 2010 and 21.6 million yuan in April 2010. The average growth rate of investment per month was the same from February 2010 to April 2010. According to the plan, how many million yuan will be invested in the drought relief in May 2010?
According to the meaning of the question, students a and B listed part of the equation as follows:
A: 1500 [1 + х] & sup2; = [2160]
B: (х - [1500]) / 1500 = (2
To fight against the once-in-a-hundred-year drought, a certain place in Southwest China invested 15 million yuan in February 2010 and 21.6 million yuan in April 2010. The average growth rate of investment per month was the same from February 2010 to April 2010. How much money will be invested in the drought relief project in May 2010?
According to the meaning of the question, students a and B listed part of the equation as follows:
A: 1500 [1 + х] & sup2; = [2160]
B: (х - [1500]) / 1500 = (2160 х) / х
(1) According to the equations given by students a and B, the meaning of the unknown х is as follows:
A: the growth rate of investment per month
B: investment in March
(2) Please complete the equations listed by students a and B in the box
(3) According to the plan, how many million yuan will be invested in the "drinking water project" in May 2010?
1500〔1＋х〕²＝[ 2160 ]
(1+X)^2=1.44
1 + x = 1.2 (negative rounding)
X=0.2
2 = 25.92 million yuan in May
Do you have the wrong number for equation B
Let X and y satisfy the constraints x ≥ 0, y ≥ x, 4x + 3Y ≤ 12, then the maximum value of 2Y + 2 / x + 1 is (I don't know the meaning of 2Y + 2 / x + 1)
Let m = 2 (y + 1) / (x + 1), then y + 1 = (M / 2) (x + 1). In this case, the geometric meaning of M / 2 is the slope of the line passing through (- 1, - 1). The feasible region is a triangle. When the line y + 1 = (M / 2) (x + 1) passes through the intersection (0,4) of x = 0 and 4x + 3Y = 12, the maximum slope is m / 2 = (4 + 1) / (0 + 1) = 5, M = 10, that is, the maximum of 2 (y + 1) / (x + 1)
Y = - 2x x + y = 8 3x-y = 10 x + y = 0 - 2x + 7x = 24 3x-2y = 4 2y-5x = 12 2x-x = 3x is a binary linear equation?
The so-called two variables means that there must be two different unknowns, so - 2x + 7x = 24 2x - x = 3x is not, although it contains two X, it is only one variable
The same question
Topic arrangement
If an equation contains two unknowns, and the unknowns are all to the power of 1, then the integral equation is called a quadratic equation of two variables, which has infinite solutions. If conditions are imposed, it has finite solutions. In general, a system of linear equations of two variables has one solution, sometimes there is no solution, sometimes there are innumerable solutions. You can try it yourself.
The number of nonnegative integer solutions of inequality system 3-2x greater than or equal to 0 2x-7 less than or equal to 4x + 7 is ()
A.1 B.0 c.2 d.4
3-2x greater than or equal to 0
x=-7
Non negative integer solution is 0, 1 chooses C
In the first quarter of production, the output value of a factory in January is 2.5 million yuan, and the monthly growth rate of the output value in February and March is the same. It is known that the total output value in the first quarter is 8.436 million yuan, so the monthly growth rate of February and March is calculated
Suppose that the monthly growth rate of February and March is X. according to the meaning of the question, 250 + 250 (1 + x) + 250 (1 + x) 2 = 843.6250 + 250 + 250x + 250 + 500X + 250x2 = 843.6250x2 + 750x-93.6 = 0, (5x + 15.6) (50x-6) = 0, the solution is X1 = - 3.12 (negative value is not the meaning of the question, rounding off), X2 = 0.12 = 12%
Let X and y satisfy the constraint conditions: x-2y + 7 > = 0, 4x-3y-12 = 0, z = Y / X
Graphic method. According to the linear programming, the feasible region is obtained. Z = Y / X is the slope of the feasible region
Is (m-2) XY a monomial or a polynomial?
The title of (m-2) is
Is this a monomial or a polynomial, a quadratic polynomial?
If M is a letter, it is a polynomial
Definition of monomial: for numbers and letters, only multiplication (including power) operation of the algebraic formula
And (M - 2) XY is a polynomial because of subtraction and multiplication
(M - 2) xy = MXY - 2XY, obviously, it is composed of two monomials
In a polynomial, the degree of the term with the highest degree is called the degree of the polynomial
So, (m-2) XY is a cubic binomial
If M is a constant, then it is a monomial
In this case, m-2 is regarded as a constant
The sum of the exponents of all the letters in a monomial is called the number of times of the monomial
So, (m-2) XY is a quadratic monomial
monomial
Monomial, take (m-2) as a constant, XY is a product, so it is a monomial (in the form of product), polynomial is the form of sum
It's a binomial. It's a quadratic binomial
If the integer solutions of the inequality system 7x − m ≥ 06x − n < 0 about X are only 1,2,3, then the integer pairs (m, n) suitable for the inequality system share ()
A. 49 pairs B. 42 pairs C. 36 pairs D. 13 pairs
The solution set of 7x − m ≥ 06x − n ＜ 0 is M7 ≤ x ＜ N6, and the integer solutions of 7x − m ≥ 06x − n ＜ 0 are only 1, 2, 3, 0 ＜ M7 ≤ 1, 3 ＜ N6 ≤ 4. The solution is 0 ＜ m ≤ 7, 18 ＜ n ≤ 24. The total number of 1, 2, 3, 4, 5, 6, 7 for 7x − m, and 19, 20, 21, 22, 23, 24 for N. there are 7 × 6 = 42 pairs of integers (m, n), so B is selected
If the monthly growth rate of the store's profit is the same, ask: (1) the average monthly growth rate of the store; (2) how much is the total profit of the store in the first quarter?
(1) Suppose the average monthly growth rate of the store is X. according to the meaning of the question: 1500 (1 + x) 2 = 2160, the solution is: x = 0.2 = 20% or x = - 1.2 (rounding off). Answer: the average monthly growth rate is 20%. (2) the profit in February is 1500 (1 + 20%) = 1800 yuan, and the profit in the first quarter is 1500 + 1800 + 2160 = 5460 yuan