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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)
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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
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Young people should be good at thinking for themselves, and such simple problems should be solved by themselves.
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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.
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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.
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Circumference: 35 * 2 * approx.) =
Per minute**: 1099 minutes.
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35cm = C Tires = Pi Symbol....m one minute away = pi sign....*100=70 (pi sign....)m Last: Minutes = 1099 70 (Pi sign....))=
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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.
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Set the ignition for x hours, then.
4-x=3(3-x)
Sorted out. x=
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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.
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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
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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.
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Solution: The class has a total of 26 13 25 = 50 people.
I'm a teacher, thank you.
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Solution: Class size: 26*25 13=50 (people).
A: There are 50 students in the class.
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