Hurry up and turn it in tomorrow, a math problem

Because (2-a) +a +b+c+|c+8|=0 so a = 2, c = -8, a + b + c = 0

Substitute a + b + c:

4+b-8=0

b = 4 to ax + bx + c = 0:

2x²+4x-8=0

x1=-4，x2=2

x1=-4 substituting x +2x:16-8=8, then the arithmetic square root is 2 2x2=2 substituting x +2x:4+4=8, then the arithmetic square root is 2 2 so the answer is 2 2

Hope o ( o

2-a）²、a²+b+c、|c+8|are three numbers greater than or equal to 0, and their sum is zero, so they are all zero.

i.e.: 2-a=0 a=2

c+8=0 c=-8

a +b+c=0 i.e. 4+b-8=0 b=4, so substitute a=2 b=4 c=-8 into ax +bx+c=0.

2x²+4x-8=0

Divide both sides of the equation by 2.

x²+2x-4=0

So x +2x=4

The arithmetic square root of x +2x is the arithmetic square root of 4.

The arithmetic square root of x +2x is 2

This question is the correct answer!

2-a=0 means a=2 c+8=0 means c=82+b+8=0 b=-10

2x²-10x+8=0

x²-5x+4=0

x=4 or x=1

Hope: Pure hand-hitting.

The volleyball game is a 25-point system, but the score difference between the two teams is at least 2 points, if the Chinese team wins at 25 points, the total score is only 25 3 = 75, less than 3 points, you can guess that the Chinese team must have played 25 points, and the score is reduced in turn and does not exceed 4 points (less than or equal to 4 points), guess the first game 25:21, the second game 25:22, then the third game should be 28:

26, the score difference is 4,3,2. And the total score is the same, you can, guess the first game 25:22, the second game 25:

23, then the third game is 28:24, which does not meet the regulations, and the score gap is not right, no, when 1 is 25:23, 2 is 26:

24,3 is 27:22, not compliant, not (note: the score difference must be greater than 2 points), you can know 1,25:

21 difference of 4 points 2, 25:22 difference of 3 points, 28:26 difference of 2 points, the total score of the Chinese team is 25 + 25 + 28 = 78, and the total score of the South Korean team is 21 + 22 + 26 = 69

The following formula can be replaced.

x times y plus the square of y, and the above formula is added to get the square of x plus 2xy and then the square of y, the perfect square formula, can be reduced to (x+y) square is equal to 5, both sides are squared at the same time, x+y = positive and negative root number 5, and then divide the two formulas to get x divided by y is equal to two-thirds, so x is equal to two-thirds y, substitute x+y = root number 5, you can get five-thirds y is equal to positive and negative root number 5, so y is equal to three times the root number 5 or three-fifths of the negative root number 5, Substituting x equals two-thirds y, we get a root number 5 where x is equal to two-fifths or a negative root number 5 that is two-fifths times greater.

If there are x books in this batch, then A and B should be bound 1 2*x 1 2*x*5 6-1 2*x*3 4=126x=3024

There are a total of 3,024 books in this batch.

There are two tasks, A and B, each with x books.

5/6*x-3/4*x=126

The solution is x=1512

There are a total of 1512*2=3024 books in this batch.

Set up group A task x, because it is evenly divided between two groups, A and B, so group B task is also x.

Then there are: 5/6 x - 3/4 x = 126

Just solve it.

Let a total of x books, then group A x 2, group B x 2, when group A completes 5 6 of x 2, group B just completes 3 4 of x 2, so (x 2) * (5 6) - (x 2) * (3 4) = 126

So x = 3024 copies.

There are a total of x books, because the tasks of groups A and B are divided equally, so the tasks of groups A and B are x 2 respectively, according to the topic.

5 6*x 2-3 4*x 2=126

x=3024

Hour.

6 (km.)

(kmh.)

10 3 = 30 km.

3. Kilometers per hour.

min = 1 3 hours.

15-9) 1 3 = 2 km.

6 + 50 6 = 780 meters.

780 (80-50) = 16 points.

50 16 = 800 meters.

Added:7;; 250

A walks to a place at a speed of 6 km/h, and after that, B chases A on a bicycle at a speed of 18 km/h. By the time B catches up with A, A has already traveled (45/2) km.

30km15km

1km1600m

Root 16 = 4 Root 25 = 5 So 4 "Root 17<5 -5< - Root 17<-4 And Root 9 = 3 Root 16 = 4 So 3 "Root 11<4 So (1) All integers greater than - 17 and less than 11 have it.

There are so many questions that offer a reward of 0 points.

Take a look and you'll find out.

Each of the h is multiplied by 5 and the remaining number.

Respectively, these four numbers are the square number of , .

So h = 5 * t squared).

When t = , h = 5 * 5 * = m.

Mathematics, physics and chemistry are interconnected, in physics: h 1 2*g*t 2 when g 10 is taken; h＝5t^2

1）：h＝5t^2

2) When t=, h=5* (m).

(1) According to Newton's second law, h=1 2gt 2 (g is the acceleration of gravity, theoretically for the convenience of calculation, g=10m s 2);

2) When t=, h=1 2*10*.

h=5*t2 (i.e., 5 times t squared).

When t=, h=5*

2.A pencil x yuan, an eraser y yuan 3 pencils and 2 erasers the amount of money b = -3 (a + 6) - (3-b) + 2 = 32m -4m = 2 2m -4m + 2008 = 20105（7y-3z)（8y-5z）=56y^2-35yz-24yz+15z^2=56y^2-59yz+15z^2

1。It is known that the unit price of B drink is X yuan bottle, and the unit price of A drink is 1 yuan less than that of B drink, Xiaofeng bought 2 bottles of A drink and 3 bottles of B drink, and spent a total of (5x-2) yuan.

A unit price: x-1

It took a total of 2 (x-1) + 3x = 5x-2

2。The algebraic formula 3x+2y can be interpreted as ( ).

3 x times and 2 y times the sum.

Or: X yuan per kilogram of apples, y yuan per kilogram of pears, how much is it to buy 2 kilograms of apples and 3 kilograms of pears.

3。If |a-1|+(b+3) = 0, then the value of (a+6)-(3-b)+2 is (3).

Both the absolute value and the square number are greater than or equal to 0.

The sum of two numbers greater than or equal to 0 equals 0, then both numbers are 0

a-1=0b+3=0

Solution: a=1, b=-3

a+6)-(3-b)+2=(1+6)-(3+3)+2=7-6+2=3

4。If m -2m = 1, then the value of 2m -4m + 2008 is (2010).

2m^2-4m+2008

2(m^2-2m)+2008

5。Operation: 7y-3z) (8y-5z) to process.

7y*8y-3z*8y-7y*5z+3z*5z

56y^2-24yz-35yz+15z^2

56y^2-59yz+15z^2

1. 5x-2

2.The sum of three times x and two times y.

5.= 56y squared - 35zy-24zy + 15z squared = 56y squared - 59zy + 15z squared.

The first question is 5x-2

The second question is the sum of 3 x and 2 y.

The third question is B+3, is there a 2 in the upper right corner? If it's 2, then a is 1, b is -3, and when I bring it back, I know that the value is 3

The fourth is 2010, you take 2m square-4m out of 2, it's the same as the previous fifth (7y-3z) (8y-5z).

7y*8y-7y*5z-3z*8y+3z*5z=56y-59yz+15z.

It's too troublesome for me to square this, * is a multiplier sign.

halo, 1, (x-1)*2+x*3=5x-2;

2. I don't know what this questioner is trying to ask?

y-square-59xy+15z-square.

951801027, hello:

The work efficiency ratio of A, B C is:

1 6) :( 1 7) :(1 8) 28:24:21A should be machined parts:

3650 28 (28 24 21) 1400 (pcs) B should be machined parts:

3650 24 (28 24 21) 1200 (pcs) C should be machined parts:

3650 21 (28 24 21) 1050 (pcs).

6+7+8=21

A: 3650*(6 21) 1043

B: 3650*(7 21) 1217

C: 3650*(8 21) 1390

Belch. I was wrong, I was wrong in the beginning.

Because the time ratio is 6:7:8, the velocity ratio is 1, 6:1, 7:1, 8, which is 28:24:21

A: 3650 * (28 28 + 24 + 21) = 1400 B: 3650 * (24 28 + 24 + 21) = 1200 C: 3650 * (21 28 + 24 + 21) = 1050

The time required to process a part is 6:7:8

Then the processing parts at the same time, the quantity ratio of A, B and C is (1 6) :( 1 7) :( 1 8).

A should be machined parts * 3650 = [28 (28 + 24 + 21] * 3650 = (28 73) * 3650 = 1400

B should be machined parts * 3650 = [24 (28 + 24 + 21] * 3650 = (24 73) * 3650 = 1200

C should be machined parts * 3650 = [21 (28 + 24 + 21] * 3650 = (21 73) * 3650 = 1050

A, B and C should each process parts 1400, 1200, 1050

6+7+8=21

Suppose A does x, B does y, and C does z, then 3650x6 21x=3650x7 21y=3650x8 21z, we get the formula 6x=7y=8z, and x+y+z=3650

Just figure it out.

The time ratio is 6:7:8

The efficiency ratio is 1 6:1 7:1 8=28:24:21 A 3650x28 73 = 1400.

B 3650x24 73 = 1200 pcs.

C 3650x21 73 = 1050 pcs.

A 3650x28 73 = 1400 pcs.

B 3650x24 73 = 1200 pcs.

C 3650x21 73 = 1050 pcs.

Thank you for adopting.

The time ratio is 6:7:8

Then, the efficiency ratio is (1 6) :( 1 7) :(1 8) = 56:48:42 = 28:24:21

A 3650 * (28 73) = 1400 B 3650 * (24 73) = 1200 C 3650 * (21 73) = 1050.