What is the difference between 2 yuan 1 time and 1 yuan 2 times

The difference is: one yuan twice is cheaper, and two yuan is more expensive once.

One dollar twice is equivalent to 5 cents once.

Two dollars at a time is equivalent to one yuan at a time.

So the difference is that two dollars at a time is more expensive!

"Meta" represents the number of unknowns or variables, and "Times" represents the highest number of unknowns or variables.

2 yuan 1 time means that there are 2 variables, and the highest number of times is 1, such as equation 2x+y=3

1 yuan 2 times means that there is 1 variable, and the highest order is 2, such as the equation x 2 + x-1 = 0

2 yuan 1 time refers to 2 unknowns, and they exponentially have 1

1 yuan 2 times refers to 1 unknown number, and its exponent is 2

Example: x+y=1......2 yuan 1 time.

x^2=0……$1 2 times.

2 yuan 1 time, which means that there are 2 unknowns, and the index of the unknown numbers is 1, for example: x+y=10

1 yuan 2 times, it means that there is an unknown number, and the index of the unknown number is 2 for example: x 2 + 10 = 82

x+2y=5

2x+y=15

There are two unknowns, but only once.

It is 2 yuan 1 time.

x=3x-6

There is an unknown, but it appears twice.

It is 1 yuan 2 times.

The element refers to the number of unknowns, which refers to the number of unknowns, squared, or whatever.

For example, x+y is binary and 5x squared is one-dimensional quadratic.

The element refers to the number of unknowns in the equation, and the number of unknowns refers to the number of unknowns.

The square of x (to the 2nd power) + 5 = 21 is a 1 element of the 2nd order equation with only 1 unknown term x

x+y=15 is a 2-element first-order equation because there are two unknowns and the order is 1

It is x+y=4, and there are two unknowns of 2 yuan at a time.

1 yuan 1 time is an unknown number, such as x+x2=6

x+y: 2 yuan (x, y) 1 time (x, y times are 1).

x 2: 1 yuan (x) 2 times (x times is 2).

Binary once means that there are two unknowns when solving the problem. One element quadratic means that if you set an unknown number, the answer is two.

2 yuan once is a little more expensive than 1 yuan 2 times!

An integral equation that contains only one unknown (unary) and the highest order of the unknown term is 2 (quadratic) is called a quadratic equation. The standard form is: ax + bx + c = 0 (a≠0).

A binary quadratic equation is an integral equation that contains two unknowns, and the highest order of the term containing the unknowns is two, which is called a binary quadratic equation. Its general formula is ax2+bxy+cy2+dx+ey+f=0. (a, b, c, d, e, f are constants, and at least one of a, b, and c is not zero; When b is zero, a and d and c and e are not all zero, respectively; When a=0, at least one of c and e is not equal to zero, and when c=0, at least one of a and d is not zero).

In the equation, there is only one unknown number that is unary, and the power of this unknown number is 2 is quadratic, in other words, quadratic means that there are two consecutive unknowns multiplied in the equation.

A quadratic equation is an integer equation with only one unknown number and the highest number of unknowns is 2, and its general form is ax 2 bx c=0 A quadratic equation has four characteristics: (1) it contains an unknown; (2) And.

There is only one unknown, and the highest number is 2 times, for example, the flat placement of x is one yuan quadratic.

Judgment punch = (2m+3) -4(m-1) 4m +12m+9-4m +8m-4

20m+55(4m+1)

m<-1/4

4m<-1

4m+1<0

Therefore, it is judged that the Li Tanzi style is less than 0

Equations have no real roots.

a=1,b=2m+3,c=(m-1)^2,=b^2-4ac(2m+3)^2-4(m-1)^2

4m^2+12m+9-4m^2+8m-4

20m+5 because m disturbs ashwagandha -1 4

Therefore, 20m+5<0, so there is no solution to the equation of Li manuscript.

Solution: (1) Suppose the unit price of the store's goods is x yuan kg, and the corresponding daily sales volume is y thousand bushes and 2 x 7.

y=kx+b，k=△y/△x=-2/

Because the sales unit is set at 7 yuan per kilogram, the daily sales volume of the seepage hole is 60 kilograms, so there is.

60=-20×7+b ，b=200

That is, there is y=-20x+200.........

Because, profit = total sales price - cost.

So 500=xy-2y.........

Solve the system of equations, yes.

20x²-240x+900=0

There is no real solution to the equation.

Therefore, it is impossible to reach the daily profit of 500 yuan.

240=xy-2y………

Joint equation , Yes.

20x²-240x+640=0

x1=x2=

Take x=4, that is, the unit price is 4 yuan kg.

If an equation contains two unknowns, and the number of unknowns is 1, then the integral equation is called a binary equation, with an infinite number of solutions, and a finite number of solutions if the conditions are added. The general form of a binary linear equation: ax+by+c=0, where a and b are not zero, this is the definition of a binary linear equation.

The solution of a binary linear equation: The value of two unknowns that equalizes the values on both sides of a binary equation is called the solution of a binary linear equation.

Binary Linear Equation System Definition: It is composed of two binary linear equations combined, which is called a binary linear equation system. Solution of a system of binary linear equations:

The common solution of two binary linear equations is called the solution of a system of binary linear equations. The solution of a system of binary linear equations generally has one solution, sometimes no solution, and sometimes an infinite number of solutions, such as parallelism in a primary function.

The binary linear equation system solution method is generally to eliminate the element of the binary equation and turn it into a unitary equation to solve. There are two ways to eliminate elements:

That is, there are two unknowns, and the number of unknowns is 1

Two unknowns, and the highest number of unknowns is once.

Two unknowns and the highest number of times is one.

An equation with unknowns is called an equation.

You're not talking about binary equations.

Every equation contains two unknowns, and the number of unknowns is one, and an equation like this is called a binary equation. Together, two binary equations form a system of binary equations.

Binary one-time: addition and subtraction and substitution.

Indefinite equation: A binary linear equation whose solution is indefinite if there are no other conditions, so we call it an indefinite equation.

Deformation, integer separation, commutation, deformation, integer separation until the unknown coefficient is 1.

For example, solve an indefinite equation: 5x + 7y = 978, and find the number of positive integer solutions.

Solution: The original equation can be deformed as:

Let , get: 5k=3-2y, let , then k=1-2t

t is the integer before the opening).

x and y are positive integers.

The integers that meet this condition have 1, 2, and 3 ,......28, so the original equation should have 28 sets of positive integer solutions.

In general, for the binary indefinite square land range: ax by c, there is the following conclusion:

1) If (a, b) c, then the indefinite equation has an integer solution, otherwise there is no integer solution.

2) If (a,b) 1,( is a set of solutions of ax by c, then all solutions of the original indefinite equation can be written as: (t is an integer).

x Blind +2 (2-m) + 3-6m = 0

x+1-2m)(x+3)=0

The solution yields x=2m-1 or x=-3

When 2m-1=3*(-3), m=-4 is obtained

When the celery is -3=3 (2m-1), the first annihilation is m=0