Help solve a math problem Please, help solve a math problem

Is there no **, please? I think point A should be on a straight line, not an arbitrary point A. Also In which straight line is point A? Is the question incomplete?

If point A is on MN and near point N, and the tractor is traveling in a straight line PQ, then you can make a perpendicular line from point A to a straight line PQ, and the vertical foot is D. In the triangular ADP, the distance of the AP is known, and the degree of the angle APD is also known, then we can find that the distance length of the AD is 80 meters, and the range of noise should be a circle with the tractor as the center and a radius of 100 meters, and this circle is the range of noise. The AD distance is 80 meters, less than 100, so within the noise influence range, then school A will be affected, as for the impact time, it should be centered on point A, with a radius of 100 as the circle, and the intersection point of the circle and the straight line PQ as E and F, then when the tractor is driving in the EF section, the school is affected by the noise.

In a circle centered on A, we can find that the length of EF is 120 meters, then the distance divided by the speed is the affected time, and when the speed is 18 kilometers, the affected time can be found by unit conversion. It may be difficult to understand because I can't draw a graph, so if you don't understand, you can ask me.

If point A is somewhere else or near the m-end of a straight line Mn, then it should be calculated separately, but in the same way, depending on the figure.

Where is your P-point?

It can be concluded that y=3x-1

2.Because x+4y-3z=0, 4(x+4y-3z)=0, i.e., 4x+16y-12z=0, and because 4x-5y+2z=0

21y-14z=0, i.e., z=

Substituting z= into x+4y-3z=0 gives x=, so x:y:z=1:2:3

3.Replace x=1

Y=-2 is substituted for ax-by=1 to get a+2b=1, and x=2 is added

y=0 is substituted for ax-by=1 to get 2a=1, that is, a=, and because a+2b=1, b=

4.According to the definition of a homogeneous term, an term that contains the same letters, and the exponents of the same letter are also the same, is called a homogeneous term, and all constant terms are homogeneous. Because.

The y+5 power of 5a is the same as the 2x power of -4a, so y+5=2x

And because the 3x power of b is the same term as the 2-4y power of b, 3x = 2-4y

Simultaneous equation y+5=2x

With 3x=2-4y, we get x=2, y=-1

1.(n+2)(n+1) 2, substituting n=10 gives 662There is no picture and no truth.

3.There is no picture and no truth.

4.There is no picture and no truth.

5.(1) Solution: 3m-6=2m, then m=6

then 2(6-3)-n=4

then n=22) solution:

ap pb=2, that is, ap=2pb

then pb=1 3 ab=2

ap=2/3×ab=4

q is the pb midpoint.

pq=1aq=5

6.There is no picture and no truth.

Let's take this six-digit number from the highest digit to the single digit in order of a, b, c, d, e, 7, we will abbreviate this six-digit number as abcde7

Then according to the title, abcde7 * 5 = 7abcde, looking at the formula, e is obviously 5, then substituting the above equation gives abcd57 * 5 = 7abcd5

It can also calculate d = 8, substitute the above formula to get abc857 * 5 = 7abc85 and calculate c = 2, substitute the above formula to get ab2857 * 5 = 7ab285 and calculate b = 4, substitute the above formula to get a42857 * 5 = 7a4285 and finally calculate a = 1

Then the original six-digit number is 142857

Divide by 1000 and convert y=1 (1+x). x2+3x3+x4-3=0。I don't see the rational roots.,It's not easy to decompose.,There are probably two solutions x1<-2.，0

The single digit of this two-digit number is x, and the ten-digit number is (7-x)10(7-x+2)+(x+2)=2[10(7-x)+x]-390-10x+x+2=140-18x-3

9x+18x=140-3-92

9x=45x=5

This two-digit number is 25