Knowing that the solution of equation 2x 2y m, 5x 2y m satisfies equation 3x 2y 14, find the value o

2x＋2y＝m

5x－2y＝m

Solution: Add two equations to get it.

7x=2mx=2m/7

Substituting x=2m 7 into 2x 2y m, get.

y=3m/14

Substitute what you want into 3x 2y 14.

6m/7+3m/7=-14

9m/7=-14

9m=-98

m=-98/9

It's simple. 1）2x＋2y＝m

2）5x－2y＝m

3）3x＋2y＝－14

Use equation (3) to convert to an equation of x or y.

Then we bring in equations (1) and (2) respectively, and then (1) and (2) form a system of 2-element 1st order equations and then solve them.

It's hard for me to calculate, you can do it yourself!

It can be solved according to the solution method of the ternary system of equations.

From 2x 2y m, we get x=2m 7, and by substituting x=2m 7 into 5x 2y m, we get y=3m 14

6m 7+3m 7=-14, calculated m=-98 9

It's a very simple and basic ternary equation, which has to be asked on the Internet, you are very lazy to learn, children. Think for yourself, or it will be even more difficult in the future.

2x+2y=8m (1)

5x-2y=m (2)

1) + (2) get:

7x=9mx=9 7m, then y=19 7m

Then 3x+2y=65 7m=-14

So m=-98 65,1,2x 2y 8m, 5x 2y m add up to 7x=9m

x=9m/7

Plus 2x 2y 8m

3x+2y=65m/7=-14

m=-14*7 65=-98 65,2, which is a ternary solution. Since x,y,m must satisfy all three equations at the same time, it is enough to combine the three equations to solve x,y,m. , 2, by the system of equations.

2x＋2y＝8m a

5x－2y＝m b

A-8B, gotcha.

2x+2y-40x+16y=0

i.e. y=19x 9 brought in.

3x＋2y＝－14

, x=-126 65

y=-266/65

So m=5x-2y=-98 65,0,-98 65,0, hey, they are all right! There's not much more to say! Took 2 points and left!

0, from the condition x=(-14-2y) 3, then 2(-14-2y) 3+2y=8m, and the solution is m=7 20+1 3y. , 0, 1 sub plus 2 formula.

Get the relation of x with respect to m.

7x=9m is the same as understanding the relation y to m.

Bring x,y to 3x 2y 14

Solve the answer In addition, junior brother, you have to do the basic questions yourself! Refueling, 0, the solution of the known system of equations {2x 2y 8m, 5x 2y m satisfies the equation 3x 2y 14, find the value of m

Binary Equation Basic Training Questions, (Now the Problem is Like Three Players at a Time).

4 has been socks orange to know the equation Tong good funny + x 2-6x + 5-m = 0, + the authorities sell m why the value of the time to meet: -|At 0x<5+, the equation has a real root -||0x

First, we need to determine the discriminant d of the equation. The discriminant formula d of the equation satisfies d = b 2 - 4ac, where a, b, c are the three destruction coefficients of the equation, respectively. For a given equation x 2 - 6x + 5 - m = 0, a = 1, b = 6, c = 5 - m.

Substituting these values into the formula of the discriminant gives d = 6) 2 - 4(1)(5 - m) =36 - 20 + 4m = 4m + 16. Next, we need to determine whether the equation has a real root or not. According to the condition -|0x < 5, we get -5 x, which is x > 5.

The sufficient and necessary condition for an equation to have a real root is that the discriminant d is greater than or equal to zero. So, we can get the inequality 4m + 16 0, which is 4m 16, which is m 4. To sum up, when m 4, the equation has real roots.

Summary. m-5 x-mx 3, so m-5 3-m2m 5+32m 8m=8 2m=4

Knowing that the solution of the equation +m+-5=+x+-+m+ is +x+=3, then the value of +m+ is.

Dear, hello, very happy to help you learn should be trembling This is the equation about x, I hope you will seriously describe the equation of your hole socks, there are too many plus and minus signs, but it can't be concentrated in one place.

m-5 x-mx 3, so m-5 3-m2m 5+32m 8m=8 2m=4

According to the buried situation you described, I analyzed it specifically, so I answered it for you according to my understanding, and I hope you will refer to it carefully.

The solution of the system of equations is x=(m-1) 4, y=(m+3) 4

Then substitute x+y=2m-7, and the solution is m=5

Analysis: According to the solution of the equation=5 about x is 1, then substitute x=1 into the value of m to find the cavity rent Sun Ke

The solution of the equation =5 about the type of pulse x is 1, =5, and the solution is: m=14 so the answer is: 14

Comments: This problem mainly examines the solution of the chain of fractional equations, and substituting x=1 into the value of m is the key to solving the problem

2x+3y=7

5x-y=9

Solve the above equations.

x=2 y=1

Substituting 3x+my=8, so 3*2+1*m=8, so m=2

If the answer is satisfactory, don't forget to take it!

Question: If the solution of 2x 3 21 is the same as that of 5x 1m 30, then what is m.

Answer: If the solution of 2x 3 21 is the same as that of 5x and m 30, then the value of m is required, and the value of x can be found first.

Obtained from 2x 3 21.

2x=21—3

2x=18 gives x=9

Bring x=9 into 5x-m30 and get.

5x9—m=30

45—m=30

m=45—30

m=15

m is 15, and the solution process is:

2x +3=21 ①

5x-m=30 ②

From available: 2x+3=21

2x=18 gives x=9

Substituting x=9 into , we get:

5x9-m=30

Solution: m=15

Solution: According to the question:

2x+3=21

Shift: 2x=18 coefficient to 1: x=9