Math problems. Precise process. Simple math problems, to write the solution process.

1. If m+n=3, then the value of 2m +4mn+2n -6 is?

m+n)²=9 2m²+4mn+2n²-6=2(m²+2mn+n²)-6=2x9-6=12

2. Decompose the factor: ax -ax-2a=a(x -x-2)=a(x-2)(x+1) x -12xy+35y) x-5y) =(x-5y)(x-7y) x-5y=x-7y x -y -2x-2y =(x -y)2(x+y)=(x+y)(x-y)-2(x+y)=(x+y)(x-y-2) m -mn+mx-nx =(m+x)(m-n)

x+y)²-2x-2y+1=( x+y)²-2(x+y)+1=(x+y-1)² 27x²+18x+3 =3(9x²+6x+1)=3(3x+1)² x²-y²-4y-4=

x -(y +4y+4)=x -(y+2) =(x+y+2)(x-y-2)(3, the polynomial about x is known to be 3x +x+m after factorization, there is a factor of (3x-2) to find the value of m. 3x²+x+m=3x²-2x+3x-2=(x+1)(3x-2)

1.Since the square of (m+n) is equal to m+2mn+n, the original formula can be reduced to 2(m+n)square-6 to obtain 2*9-6=12

Young people should be good at thinking for themselves, and such simple problems should be solved by themselves.

The radius of the outer tire is meters.

Distance traveled per minute.

100* meters.

It takes time to cross a bridge with a length of 1099 meters.

1099 minutes.

From the meaning of the title: the radius of the circle is 35 centimeters, that is, meters;

So the circumference is 2* meters;

Walk meters per minute.

Time required 1099 220 = 5 minutes.

Circumference: 35 * 2 * approx.) =

Per minute**: 1099 minutes.

35cm = C Tires = Pi Symbol....m one minute away = pi sign....*100=70 (pi sign....)m Last: Minutes = 1099 70 (Pi sign....)）=

Solution: Let one candle be 3 times larger than another candle after x hours.

4-x=3(3-x)

4-x =9-3x

x+3x=9-4

2x=5x=5/2

x = A: After an hour one candle is 3 times larger than another.

Set the ignition for x hours, then.

4-x＝3(3-x)

Sorted out. x=

A factory produces a machine tool, and the number of defective products is 1 9Later, after a review, it was found that there was another unqualified machine tool, at this time, the number of defective products was 3 22 of the number of **How many machines are there in this batch?

The original defective product accounted for all: 1 9 [1 + 1 9] = 1 10

Now the defective round trillion accounts for all: 3 22 [1 + 3 22] = 3 25

The number of defective products has increased by one. Then there are all of them: 1 [3 25-1 10] = 50 units.

There are 52 workers in a workshop, of which 1 4 of the male workers are 1 3 less than 1 3 of the female workers. How many men and women are there in this workshop?

1 4 of the male workers is 1 less than the 1 3 of the female workers, then all the male workers are 1 3 (1 4) = 4 3 less than the female workers: 1 (1 orange tomato rent 4) = 4 people.

Then the female workers are: (52+4) (1+4 3)=24.

Then the male worker is: 52-24=28 people.

1.Set this batch of machine tools Feng Chun Ant has a total of x units, and get 8 9x-1 = 19 22x to get trousers x = about equal to about 40

2.Let the original male worker x people, get 1 silver buried 4x=1 3(52-x)-1 get x=28

To relieve boredom in Shitong, set 2 classes for x people, then 1 class turned out to be 11 12x people.

11/12x-1):x=9:10

Solution: x=60

Therefore, there are 11 12x-1=55 1=54 (people) in Class 1, and there are 60 people in Class 2.

Look back at the branches.

Solution: The class has a total of 26 13 25 = 50 people.

I'm a teacher, thank you.

Solution: Class size: 26*25 13=50 (people).

A: There are 50 students in the class.