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Question 1: The original number is x in the tenth place, and y in the single place, so as to obtain the equation.

100x+10y+1)-(100+10x+y)=234 is simplified to 10x+y=37

Because the unit digit of the original three-digit number is y, the changed number is yes, and the unit digit of their difference is 4, so it gets.

11-y=4

y=7 substitute y=7 into 10x+y=37

If x=3, then the original three-digit number is.

Question 2 is based on the meaning of the question, A needs 10 hours to complete the journey, and B needs 5 hours to complete the journey, then, A walks 1 10 per hour, and B walks 1 5 per hour, let's set off to catch up with A x hours later, and the equation is obtained.

10-6）/5+x/10=x/5

Solve the equation. x = 4 hours.

Because B leaves at 10 a.m. and 4 hours later at 2 p.m., the time for B to catch up with A is 2 p.m.

The answer to 1: 137

Answer for 2: 1:20 p.m

1.Let the ten digits and the two digits on the single digit be x, then.

10x+1）-（100+x）=234

The solution is x=37, so the original 3 digits are 137

2.Regard the distance between the two places as a whole 1, and set B x hours to catch up with A, according to the topic.

1/5-1/11）*x=（1/11）*4

Solution, x=10 3, 10+10 3=13+1 3, that is, at 1:20 p.m., B catches up with A.

1、(x+1)^5/(-1-x)^4=(x+1)^5/(1+x)^4=1+x

So 1+x=3x+7

So x=-3

2. Set the dividing formula to y, x 2+2x-1=yx-1

So y=[(x 2+2x-1)+1] x=[x 2+2x] x=x+2

The first question is x=—3

The second question is x+2

2x-1/3-5x+1/2<1

3x+1/6<1

3x<5/6

x>-5/18

Because less than or equal to can't be played, so use less than to replace less than or equal to.

The seventh is 90, but the eighth question is multiplied by 10 to the 38th power.

-5）-l-9l=-5-9=-14

It is known that the sum of the opposite numbers of these two numbers is (1), and the opposite number of the sum of the two numbers is (-1) The absolute pulse value of the sum of the two numbers is (1) The sum of the absolute values of the two numbers is (1) The sum of the absolute values of the two numbers is (12).

The above equation is equal to minus 5 minus plus nine.

The final answer is -14

The opposite number of 5 and 1 state Yinling 2 is negative 5 and Fan Qi 1 2 negative 6 and 1 2 The opposite number is 6 and 1 2

The sum of the opposite of two numbers is 1

If the sum of two numbers is minus 1, then the opposite of its opposite number is 1

The sum of two numbers is a tremor minus 1, then its absolute value is 1

The sum of the absolute values of the two numbers is 12

(10), Xiao Ming draws a triangle in the plane Cartesian coordinate system, if he translates the triangle to the right by 5 unit lengths, then the abscissa of the three vertices of the triangle is the x coordinate +5 and the ordinate is the original y coordinate

11), walk 100 meters north from Xinhua Bookstore to the shopping mall, walk 250 meters west from the shopping mall to the gymnasium, if the coordinates of the gymnasium are (-250,0), then the selected coordinate origin is the shopping mall

13) In the planar Cartesian coordinate system, the point a(-4,0) b(0,2) is known, and the line segment ab is now translated so that a coincides with the coordinate origin o, then the coordinates of point b after translation are 4,2).

10. What are the coordinates of the original point of the triangle?

First: shopping malls.

Question 2: (4, 2).

（1）、c（2,6）

2) Since the two triangles are of equal height, the area ratio of the two triangles is the ratio of OD to DA length. From this, the coordinates of point d are: (4,0).

3) The conclusion is unchanged. Here's why:

In parallelograms: boc= oba (parallelogram property), set boc= oba=

and boc= bof (known condition in the question), so bof= oba;

In the triangle AEB again, aeo = oba + bae, i.e. = + the outer angle of the triangle is equal to the sum of the two inner angles).

In the triangle AGF, age = fag+AFG, i.e. = + AFG, (same reason as above).

In the triangle ofb, afg= fbo+ fob=2

In summary: =2 +

Therefore, the search for:( =(2 + + =2, is a constant constant.