The binary equation of the first day of the first year, okay to add 100!

4x-y=5 ..b

Type A *2-B.

7y=-7y=-1

x=12.(y+1)/4=(x+2)/3...a2x-3y=1 ..b

Formula A *124x-3y+5=0....c

Type B *2-C.

3y=7y=-7/3

x=,2x-3y=7 ..b

Type A-B.

3x=-6x=-2

y=-11/3

.ay-1)/4=(4x+9)/20-1...b Simplify the A formula to.

2x+3y-14=0...c

Simplify the A formula to.

4x-5y-6=0...d

Type C *2-D.

y=2x=4

1）.2x+3y=-1,①

4x-y=5 ②

2- The solution is x=1, y=-1

2）y+1/4=x+2/3,①

2x-3y=1 ②

2+ solution x=-9 4,y=-11 63)5x-3y=1,

2x-3y=7 ②

The solution yields x=-2, y=-11 3

y-1/4=4x+9/20-1②

Simplified to x=

Substituting y=53 22

The first: x=1 y=-1

Second: x=-9 4 y=-11 6

The third: x=-2 y=-11 3

Fourth: x=149 220 y=53 22

Two trains running opposite each other! Then the speed is the sum of two trains!

Let it be calculated as v kilometers per hour.

Yes: ( 70+v)*3 3600= then v=80 km/h.

1,x (2m+3n)-3y (m-1)=4 is a binary equation, then 2m+3n=m-1=1, the solution is m=2, n= -1

2，2x+y=12。There can be the following 2 sets of solutions: x=5, y=2; x=4,y=4

3,4x (2m+n-4)-5y (3m+4n-1)=8 is a binary linear equation about x and y, so 2m+n-4=3m+4n-1=1, the solution gives m= , n= , so m+n=

1 n=（ 1）

2 x = 4 or 5, y = 4 or 2

3 I don't understand, I'm watching you add.

Downstairs's fault... It will not be calculated from 1 because 2x>y, 2 sides and greater than the third side, directly from 4.

The solution can be obtained according to the meaning of the question.

2m+3n=1

m-1=1so.

m=2n=-1

2x+y=12

Because x,y are integers.

Available. x=4,y=4 or x=5,y=2

It can be obtained according to the title.

2m+n-4=1

3m+4n-1=1

Solution. m=18/5

n=-11/5

So. m+n=7/5

1· n=-1

2· 2x+y=12

When x is equal to one y=10, no.

When x=2, y=8 is no.

Substitute the possible values into the resulting values.

3.m+n=1 m=3 n=-2 (This equation is not a binary linear equation, did you write it correctly??) ）

(1)a+b=-3 a*b=-2011

a^2+4a+b+2

a^2+2ab+b^2-b^2-2ab+4a+2b-b+2=(a+b)^2-b(2a+b)+2(2a+b)-b+2=(a+b)^2-(2a+b)(b-2)-(b-2)=(a+b)^2-(2a+b+1)(b-2)=9-(a+1-3)(b-2)

9-[ab-2(a+b)+4]

Choose c(2) so that the other root is a

then a+m=-n am=m

a=1m+n=-a=-1

Choose a(3) and divide both sides of the equation by b 2

Obtain (a b) 2 + (a b) -1 = 0

The solution yields a b = (-1 + root number 5) 2 or (-1 - root number 5) 2(4)2+3=5=-p

2*3=6=q

x 2-px+q=x 2+5x+6=(x+2)(x+3) and d(5) 0 is an integer.

Let a and b be the two real roots of the equation x2+3x-2011=0, then the value of a2+4a+b+2 is ( ).

Substituting x=a into the original equation yields:

a²+3a=2011

According to Vedd's theorem, a+b=-3

a²+4a+b+2

a²+3a)+(a+b)+2

If m is the root of the unary quadratic equation x2+nx+m=0 with respect to x, and m is not equal to 0, then the value of m+n is ( ).

a.-1 c.-1/2

Substituting x=m into the original equation yields:

m²+mn+m=0

m≠0, then divide by m at the same time to get:

m+n+1=0

m+n=-1 for a

If the non-zero real numbers a and b satisfy a2+ab-b2=0, then a b = (fill in the blank).

Divide by b at the same time to get:

a/b)²+a/b-1=0

Let t=a b, it becomes.

t²+t-1=0

t=（-1±√5)/2

Then a b = (-1 5) 2

If is the root of two real numbers of the equation x2+px+q=0, then x2-px+q=0 can be decomposed into (a).

a.(x-2)(x-3) b.(x+1)(x-6) c.(x+1)(x+5) d.(x+2)(x+3)

There's not much to say about this.

Knowing the two, the corresponding equation is like this.

Is 0 an integer? Be.

x is 2/2 (root number 1999+1)?

It is known to be 2/2 of (root number 1999+1).

1.The speed of the ship in the downwater = the speed of the boat + the speed of the water

The velocity of the ship in the reverse water = the speed of the boat – the speed of the water flow

2.The basic relationship between several quantities in an engineering problem: total amount of work = total efficiency days

3.In order to reward students who have made greater progress, a class decided to buy three kinds of fountain pens as prizes, the unit prices of which are 4 yuan, 5 yuan, and 6 yuan, and a total of 60 yuan is required to buy these pens. After negotiation, the unit price of each fountain pen was cheaper by 1 yuan, and the result was only 48 yuan.

As long as the final result is fine)

It is cheaper in total: 60-48 = 12 yuan, that is, a total of 12 pens is exactly 5 yuan on average, and 60 5 = 12 (branches).

12 3 = 4, Answer: Three kinds of each 4 branches.

4.A and B are walking on the east-west road, A is 300 meters west of B, if A and B walk east for 30 minutes at the same time, A just catches up with B; If A and B are walking in the same direction at the same time, they will meet in 2 minutes. What is the speed of A and B?

Binary equations, to have accurate detailed processes).

Let the velocity of A be x meters and the velocity of B be y meters, and the system of equations according to the meaning of the problem:

300÷30=x-y

x+y)×2=300

Solution: x=80

y=705.There are a batch of 420 parts to be processed, if A does it for 2 days and then B joins the work, then it can be completed for another 2 days; If B does it for 2 days and A joins the work, then it can be done for another 3 days. Q:

How many parts does A and B each make per day? Binary equations, to have accurate detailed processes).

Let A do x every day and B do y every day, and get the system of equations according to the meaning of the problem:

4x+2y=420

3x+5y=420

Solution: x=90

y=30

1.The speed of the ship in the smooth water = v water + v ship.

The speed of the ship in the reverse water = v ship - v water.

2.The basic relationship between several quantities in an engineering problem: total amount of work = working time x work efficiency branches.

4. Suppose the velocity of A is x, and the velocity of B is y

Then: 30x-30y=300

2x+2y=300

The solution is: x=80 y=70

That is, the speed of A is 80m min and the speed of B is 70m min5, assuming that A does x per day and B does y.

Then: 4x+2y=420

3x+5y=420

The solution is: x=90 y=30

That is, A does 90 per day, and B does 30 per day.

x+y=450

2x-3y=-150

3x+3y+2x-3y=1350-150

5x=1200

x=240y=450-x=210

2x+2y=1

6x-6y=1

4x+8y=0

x=2y, substituting (1).

2*2y+2y=1

6y=1y=1/6

x=2y=1/3

2x+y=15

x+2y=2.

3x+3y=17

x+y=17 auspicious 3

x=28/3

y=17/3-x=-11/3

5x+y=3

x+5y=2

6x+6y=5

x+y=5/6

4x=13 slip and 6

x=13 Faith Banquet Trail 24

y=5/6-x=7/24

1. x=2 y=4

x=5 y=0

4. x-y=1

x=2(y-1)

5. x+y=9

3x+y=19

6.No solution The first one has no solution, and the second one has many kinds.

1.5 cars 240 people with x cars, y students, 45x+15=y and 60(x-1)=y

2.A is 420,000 B is 260,000 If A is x million and B is y million, then there is, x+y=68 and 12%x+13%y=

3.360 meters of tops and 240 meters of pants are made of x meters of fabric for tops and y meters of fabric for pants.

Then there are x+y=600 and 2x 3=y

1. x=2 y=4

x=5 y=0

3. 2x+4y= 0

4. x-y=1

x=2(y-1)

5. x+y=9

3x+y=19

6.1 no solution 2 countless group solutions.

1.5 cars 240 people.

2.A is 420,000 and B is 260,000.

3.360 meters of tops and 240 meters of pants.

1 There are A cars and B students: 45A+15=B, 60(A-1)=B, A=5, B=240

2. The amount of the two types of loans is a, b: a+b=68, a=42, b=263, and the jacket and pants should be produced from a, b fabric, respectively, and a total of c sets of a+b=600 (

a=b=c

It's a simple question.

A1x=2 y=4 x=5 y=0 Let's do these things.

1. Coincide at three o'clock.

2. The difference between the flat angle is ten or four points.

3. At right angles to three points and three points thirty-five.

Set the speed of the ship to x kilometers per hour.

4（x+2）=5（x-2）

4x+8=5x-10

x = 18s = 4 (x + 2) = 80 (km).

A: The distance is 80 km.

Happy learning!

Set the speed of the ship to x km/h.

4（2+x）=5(x-2)

8+4x=5x-10x=18

A: The two places are 80 kilometers apart.

Set the speed of the ship to x kilometers per hour.

4（x+2）=5（x-2）

4x+8=5x-10

x = 18s = 4 (x + 2) = 80 (km).