Mathematics Mathematics Mathematics Mathematics T

1.A is x, B is (2000000-x).

x * fraction) 14 x 1000 + 2000000 * 37 1000 - x * 37 10000 = 62500 to decimal places).

x=11500/

2.The temperature rises by 5 degrees, the velocity increases by 3 ms, and the rise by 1 degree increases the equation is: 331+

Minutes account for 5 minutes of 3 5, which is 60% probability.

I wish you a higher level of study, a happy Chinese New Year, and a happy family!! Thank you!

Solve the system of equations 2There is a rule: the temperature rises by 5 degrees, the speed increases by 3 ms, and the increase increases by 1 degree, so so.

The formula is speed of sound = 331+

Distance = speed of sound (331 + time (5s) = large.

1.Let A x, B 200-x

x=50 500,000 for A, 1,500,000 for B.

2.(1) Speed of sound = 331 + 3 5x

2)v=331+18*3/5=

s=vt=

1。Connecting the two intersections, this line is perpendicular to x-y+c=0, so there is 3+1 1-m=-1

And the midpoint of the line segment (1+m 2,1) must be on this straight line, so 1+m 2 -1+c=0

The two are combined, like m=5 c=-2, so it's 32. First, change the equation of the circle to the standard form.

The center of the circle is (-1,2), the radius is 5, and half of ab is 4, so the distance from the center of the circle to l is 3Use the point oblique to set l, and then use the formula of the distance from the point to the straight line, and get k=-5 12 and then bring (-4,0) into the ball straight line.

(m+1)/(3-1)*1=-1

m=-3, then the midpoint of the two intersections is (-1,1).

On the straight line x-y+c=0.

Get c = 2

1.Because the center of the circle is on the same straight line, the midpoint of the two intersecting points is on the line, and the slope of the straight line where the two points are located is -1, so that m is 5 and c is -1

2.The center of the circle is (-1,2), the radius is 5, and the ab is 4, so the distance from the center of the circle to l is 3Use the point oblique to set l, and then use the formula of the distance from the point to the straight line, and get k = -5 12

1。Connecting two intersections, the line is perpendicular to x-y+c=0, so 3+1 1-m=-1

And the midpoint of the line segment (1+m 2,1) is on this straight line, so 1+m 2 -1+c=0 is combined, then m=5 c=-2, so it is 3

2。The reference upstairs distance from the center of the circle to the straight line is 3. (1) When the slope does not exist, x=-4 holds, (2) when the slope exists, let y=k(x+4) substitute the point into the straight line formula to obtain k=-5 12Straight line 5x+12y+20=0

(1) Substituting (1,3) into the original formula 1-3+c=0, the solution is c=2, the original formula is x-y+2=0, substituting (m,-1) into m+1+2=0, the solution is m=-3, so m+c=-1

2) The circle equation can be reduced to: (x 1) y 2) 25, and the radius of the circle is 5, and the center of the circle is (-1,2). From this, the distance from the center of the circle to the straight line is 3, and since the straight line passes (-4,0), the equation can be set as:

y=k(x+4) can be sorted out: kx-y+4k=0, according to the formula of the distance from the point to the straight line: -k-2+4k under the root number k square +1=3, the solution is k=-5 12, and the straight line equation can be obtained:

y=-5／12（x+4）

Shanghai Weizhi World Blind Mountain Group Expo grinding orange stick will stick Shanghai World Expo.

Up=1, Sea=4, World=2, Bo=8, Hui=5, Stick=7;i.e. 142857x5=714285

The circular section with a divisor of 7 is used"142857"

That's how I think about it.

First of all, look at the last "stick"."Yes"In the end, there are 4 possibilities for someone to "will":

1.Stick = 6, will = 2

2.Stick = 6, will = 4

3.Bar = odd number, will = 5

4.Stick = 6, will = 8

And because of the first "on"."Yes"There is no carrying, so it must be less than 10, and the omen "bar" must be greater than or equal to "will" and "up".

Therefore, the 4th may have been excluded, and the 3rd possible "stick" can only take 7 or 9

Now you can start to extrapolate the remaining possibilities from the end to the end to the final result.

1.When rod = 6 and will = 2, it is calculated that "Bo" = 5 and "world" = 0 so far it does not meet the requirements of 1 to 9 and is excluded.

2.When the rod = 6 and will = 4, it is calculated that "Bo" = 8, "world" = 7, "sea" = 9, "up" = 8 At this time, "up" and "Bo block cheats" are duplicated and excluded.

3.When the rod = 7 and the will = 5, it is calculated that "Bo" = 8, "Shi" = 2, "Hai" = 4, and "Shang" = 1, which is in line with the title.

4.When the stick = 9 and will = 5, it is calculated that "Bo" = 9 is the same as "stick" and excluded.

So the answer is 142857x5=714285, "stick" = 7, "will" = 5, "bo" = 8, "world" = 2, "Bu Heng rents the sea" = 4, "up" = 1

The above is my reasoning process, I hope it can help you o(o

Set up x workers to produce bolts every day, and 120-x workers to produce nuts 25x:20 (120-x)=1:2

50x=20(120-x)

50x=2400-20x

80x=2400x=30

Arrange 30 workers to produce bolts and 90 workers to produce nuts every day, so as to make the most sets of products produced every day.

Set up x workers to produce bolts every day, and y workers to produce nuts x+y=120

25x×2=20y

x+y=120

5x=2yx=30

y=90

Suppose x workers are assigned to produce bolts every day, then there are (120-x) people producing nuts. Then:

2*25x=20(120-x)

70x=2400

x = if 34 people are arranged to produce bolts, then 34 * 25 = 850 bolts are produced per day, and 86 * 20 = 1720 nuts are produced, then a maximum of 850 sets of products are produced per day.

If 35 people are arranged to produce bolts, then 35 * 25 = 875 bolts are produced per day, and 85 * 20 = 1700 nuts are produced, then the maximum number of products produced per day is 850 sets.

Solution: Set x workers to produce bolts and Y workers to produce nuts.

x+y=120

24x=20y/2

Solution: x=30

y=90A: 30 workers produce bolts and 90 workers produce nuts.

The answer to this question is calculated to be a decimal, and the correct question should be: each worker can produce 50 bolts or 20 nuts per day. If it's 25 spirals, the title is wrong!

(5a+10)+√b+1)=0

5a+10)=0

a=-2(b+1)=0

b=-1a^3-b^2003

2√(x-2)+√2-x)/2=y-2

y=2 (x-2)+ wool shirt(2-x)+2(x-2)>=0

x>=2

2-x)>=0

x<=2

So x=2, y=2

Let the decimal part of 5 + 7 be a, and the filial piety.

a=√7-2

The decimal part of 5-7 is b

b=3-√7

ab+5bb(a+5)

3 2-( Cavity imitation 7) 2

(1) From the meaning of the title:

The coordinates of point A and Y are twice that of point E. i.e. 2m.

Since a is on y=2 x (x 0), a coordinates (1 m, 2 m) are obtained.

2) To make abcd square, ad=ab=2m (i.e. 2 times the y coordinate of e).

ab = 2x (x coordinates of e - x coordinates of a).

That is: 2m=2(2 m-1 m).

Simplifying it gives m2=1 and m= 1 and obviously m 0

m=1.

a=2m

exists, let the coordinates of point b be (a,0).

So a(a,2m),c(a+2m,0),d(a+2m,2m) so the coordinates of point e are (a+m,m).

Bring the coordinates of the two points of AE into the equation of the inverse proportional function.

The solution is a=m, so we put e on y=2 x(x 0).

So m=2 2m

So the square of m is equal to 1 and m>0, so m=1

The value of sina is in.

The first and second quadrants are positive, that is, they are in.

The final value obtained at the first and second quadrants is positive, and the others are shown above

……Isn't there a picture......The math book has it on it, build a Cartesian coordinate system, then draw a unit circle, and then ......You can draw periodic curve ......It's all in the math books.

Combine images and trigonometric lines.

1、a∩b=

So x=1 2 is the root of both equations.

x²+x+p=0

x1+x2=-1

x1=1/2

x2=-3/2

2x²+qx+2=0

x3x4=2/2=1

x3=1/2

x4=2, so a b=

2、x²+x+p=0

x1x2=p

p=-3/4

2x²+qx+2=0

x3+x4=-q

q=-5/2

The distance between parallel lines is |-7-8|(3 +4 )=3 The line segment is 3 2

Let the angle be a, then cosa=3 3 2

a = 45 degrees.

3x+4y-7=0 slope is -3 4

Let the slope of the straight line be k

then tana=1=|k+3/4|/|1-(3/4)k||k+3/4|=|1-(3/4)k|

k=1/7,k=-7

Over (2, 3).

So it's x-7y+19=0 and 7x+y-20=0