Can anyone help me with a few questions? It s urgent!!! Make a !!!!! with a binary equation

1. Solution: Let A account for x in the original alloy, then B accounts for 1-x, and then let the first addition of A be y kg.

Then there is (10x+ y) 10=3 (2+3)10x+2 y) 10=7 (7+3).

The solution is x=1 2=50% y=1

Answer: The original alloy accounts for 50% of the first, and the first addition of the first is 1 kg.

2. Solution: Set A to overhaul x meters per hour, and B is y meters.

then there is x-y =10

270/(x+y)=3

The solution is x= 50 y=40

A: A overhauls 50 meters per hour, B 40 meters.

Let the alloy contain X kg and B Y kg, and add Z kg for the first time.

x+z)/y=3:2

x+2z)/y=7:3

x+y=10

The solution yields x=4, y=6, z=5

Therefore, the first time 5 kg of A is added, the original percentage of the alloy containing A is 40%, set B to repair x meters per hour, and A to repair (x + 10) meters per hour.

3（x+x+10)=270

x=40x+10=50

So every hour, A repairs 50 meters, and B repairs 40 meters.

1.Let the first addition of x grams, the content of B metal in the alloy be y grams, and the equation is listed according to the inscription

2（10+x-y)=3y

3(10+2x-y)=7y

The solution is x=5 and y=6

2.Let A repair xm per hour, B fix ym per hour, and the equation is columned:

x=y+10

3(x+y)=270

The solution is x= 50 y=40

The first addition of a metal is x kgIt turns out that what percentage of this alloy is called A metal Y, then.

10y+x):(10-10y)=3:2, or 2x+50y=30.

10y+2x):(10-10y)=7:3, or 6x+100y=70

Solution, x=5 kg

y=40%

The ratio of meat buns to steamed buns is 1:3 There are a total of 240 steamed buns and meat buns, and if the meat bun is x, then the steamed bun is 3x

There are 1x+3x 240

x＝603x＝180

First, there are meat buns for the original 1-2 5 3 5

There were 60 3 5 100 original meat buns.

Assuming that x meat buns were originally going to be made, then the number of steamed buns would be 240-x.

240-x）+2/5*x=3*3/5*x

x=100

Solution: The canteen was originally prepared to make x meat buns, and the number of steamed buns was originally planned to be (240-x), according to the title:

3x/5 / ( 240-x+2x/5) = 1 : 3

Solve the equation to obtain: x=100

Set the total amount of property to be n and there are x children destroying the bridge.

then 100+(n-100)*

The solution is n=8100

Each son can share 900 grams of lang.

He had a total of 9 sons.

x-11800=(x/

Investment this year = investment last year*

x=16200

Equivalence This year times 110% - last year = last year times 135%.

Let last year's investment be x, then.

8000+x）（1+35%）—x(1+10%)=11800x=4000

Revenue = 11800 + 4000 (1 + 10%) = 16200

Solution: Let's look at m+2 as a whole and set it to x

Think of n-1 as a whole and set it to y

Get: 2x-3y=13

3x+5y=

From the problem, we can see that the solution of this system of equations is x=, y=

i.e. m+2=n-1=

The solution is m=, n=

Solution: Let's set (m+2) to x

Set (n-1) to y

Get: 2x-3y=13

3x+5y=

From the problem, we can see that the solution of this system of equations is x=, y=

i.e. m+2=n-1=

The solution is m=, n=

Comparing two systems of equations, it is found that m+2=x n-1=yx= y=

m+2= n-1=

The solution is m=, n=

If an equation contains two unknowns, and the unknowns are both to the power of 1, then the integer equation is called a binary equation with infinite solutions, and if the conditions are added there are finite solutions. In the case of a system of binary equations, there is generally one solution, sometimes no solution, and sometimes an infinite number of solutions. Such as parallelism in a primary function,.

The general form of a binary equation: ax+by+c=0, where a, b are not zero. This is the definition of a binary equation.

Definition of binary linear equations: two linear equations that are combined together and contain two unknowns are called binary linear equations.

So xy-y=8 is not a binary linear equation.

Because a binary equation must have a premise, that is, a formula with two unknowns, such as x+y=10

2x+3y=100

When solving, the basic properties of lighting with x+y=10 are used, and x=10-y is substituted into (10-y)+3y=100

y=45 your xy-y=8 can not be calculated without a prerequisite, the binary equation is to be transformed into a univariate once with a certain basic property to make it, so the equation should be learned and used, but also the definition is well understood, I wish you success in learning.

Take a look at the definition of binary equations in the book == not explained.

xy is quadratic and this equation is binary quadratic.

Solution: Set up x computers per round of infection.

It can be obtained according to the title.

1+x)²=81

1+x=±9

x=-10 (rounded), x2=8

Each round of Zen is infected with 8 sets of electric rotten brains.

After 3 rounds of infection, the infected computer will take 700 units beyond the calendar.

Solution: (1) Set x kWh of electricity consumption in May.

50+x=150

2) Set the electricity consumption in April x kWh.

x=200

The monthly electricity consumption does not exceed 100 kWh, and the cost is 100*

1) Pay 70 yuan for electricity, more than 50, so if the electricity consumption exceeds 100, set it to x100*

x=150, then the user consumes 150 kWh of electricity in May.

2) The user's electricity consumption in April x kWh.

x = 200: The user's electricity consumption in April is 200 kWh.