Ask this math problem to do?? How do I do this math problem?

Let (7x 2+9x+13)- 7x 2-5x+13)=a(1)(7x 2+9x+13)+ 7x 2-5x+13)=7x(2)1)*(2).

14x=7ax

a=2(7x^2+9x+13)-√7x^2-5x+13)=22√(7x^2+9x+13)=7x+2

28x^2+36x+52=49x^2+28x+421x^2-8x-48=0

3x+4)(7x-12)=0

x1=-4/3,x2=12/7

According to the title, the left side is the root number, then the right side is 7x>=0, that is, x>=0 So, x=12 7

7x +9x+13)-(7x -5x+13)=14x, (7x +9x+13)+ 7x -5x+13)=7x, divide the former by the latter formula: (7x +9x+13)- 7x -5x+13)=2, (7x +9x+13)= (7x -5x+13)+2, 21x -8x-48=0, x=12 7 or x=-4 3 (rounded).

2y=(x-2)^2+1

The arithmetic square root of y is 5

Then y=5, so(x-2), 2=9

Square roots are opened on both sides.

x-2=±3

x=2±3x1=5，x2=-1

So x+2y=10 or 4

15 or 9

The square root of y is 5, then y=5, substituting 2y=(x-2) +1, gives x=5 or -1

This anti-missile can be solved by dismantling the relation (note: the symbol represents several powers, (root number x) = (x ;

20-18x)/(x^

Then find the anti-missile for the disassembled relation.

The result is 40*(x.)

where c is the integral constant.

The simplest nine-house chart, looking at the nine-house chart of 1 9, each digit divided by 5, is the answer to your question above.

A total of 28,800 interest is calculated in three minutes, and there is no difficulty!

The problem that arose before was not that the ten yuan was missing, but that the algorithm behind it was not logical.

It should be calculated like this: a total of 1,000 yuan, Xiao Ming spent 970 yuan, and gave 10 yuan to his parents, that is, 20 yuan, so there are 10 yuan.

Or this is how it is calculated: Mom and Dad each borrowed 490 from Xiao Ming, and borrowed a total of 980, minus 970 for buying clothes, and there was still 10 yuan left.

The clear point is: Xiao Ming owes a total of 1000, spent 970, and has 30 left, and each has 10 yuan back, and a total of 980 is owed, and the remaining 10 yuan is not Xiao Ming's, and it also has to be repaid, so it should be 980-10=970, not 980 plus 10.

The 10 yuan left behind is not the same concept as the poor mother's 490 yuan and father's 490 yuan, and cannot be added.

Returning 10 yuan for mom, 10 yuan for dad, 490 yuan for poor mom, and 490 yuan for dad are similar concepts, which add up to 1000 yuan.

The first two 490 yuan are the money that needs to be returned to the father and mother, and the last 10 yuan is the money in their own hands, the two are not the same concept and cannot be added. If you want to ask where the 1,000 yuan went, it was 970 yuan to buy clothes, 10 yuan to pay back to my mother, 10 yuan to my father, and 10 yuan to keep for myself; If you want to ask Xiao Ming how much he owes, then it is 490 yuan + 490 yuan = 980 yuan; Xiao Ming now owns a piece of clothing worth 970 yuan, and he still has 10 yuan on hand, with a total value of 980 yuan, which is exactly the same as the debt he owes.

If X sets of machines are transported from warehouse A to factory A, then the units transported from warehouse A to factory B (20-x) will be transported from warehouse B to factory A (10-x), and warehouse B will be transported to factory B 6-(10-x) = (x-4) units, and the total freight cost is.

400x+800(20-x)+300(10-x)+500(x-4)=17000-200x=16000

solution, x=5

5 units were transported from warehouse A to factory A, and 15 units were transported from warehouse A to factory B.

5 units were shipped from warehouse B to factory A, and 1 unit was transported from warehouse B to factory B.

<> answer is such as carrying a macro liquid argument map to search for it.

Such as the grinding of the picture of the letter of the slippery front.