As shown in the figure, if the line segments a and B are known and a > 3 / 2B, use a compass and a ruler to find a line segment X so that x = 2a-3b fast

As shown in the figure, if the line segments a and B are known and a > 3 / 2B, use a compass and a ruler to find a line segment X so that x = 2a-3b fast

Method:
There are three steps
1. Ray OM
2. Successively intercept OA = AB = a on OM
3. Intercept OC = CD = de = B in sequence on ray OM
Then the line segment be is the line segment X
Oh, I can't be more detailed

The price of a suit is 480 yuan, of which the price of trousers is 60% of that of the coat. How much are the prices of the coat and trousers?

480 (1 + 60%), = 480 △ 160%, = 300 (yuan); 480-300 = 180 (yuan); a: the price of jacket is 300 yuan, and that of trousers is 180 yuan

The tolerance D of arithmetic sequence is 1 / 2, and S100 = 145, find a1 + A2 + a3 +. + A99

A2+A4+A6+…… +A100=(A1+d)+(A3+d)+(A5+d)+…… +(A99+d)=(A1+A3+A5+…… +A99)+50dS100=(A1+A3+A5+…… +A99)+(A2+A4+A6+…… +A100)=2(A1+A3+A5+…… +A99)+50d=145A1+A3+A5+…… +A99=(145-50d)/2=60

1 cubic meter = how many cubic decimeters = how many cubic centimeters 1 square meter = how many square decimeters = how many square centimeters

1 cubic meter = 1000 cubic decimeter = 1000000 cubic centimeter
1 square meter = 100 square decimeter = 10000 square centimeter

The distance between a and B is 471km. The two trains leave from the two places at the same time. After three hours of meeting, it is known that the passenger train runs 82km per hour, and the freight train runs 82km per hour
How many kilometers per hour

Set up freight cars to travel x kilometers per hour
82+x=471÷3
x=75

Unit of weight: if gram is expressed in letters, which letter is g of two circles or g of one circle

g
This is it,

How to solve x-3.5x + 5 = 80% X

This one-way equation is not very difficult
x-3.5x+5=80%x
-2.5x+5=0.8x
5=0.8x+2.5x
5=3.3x
X = 5 divided by 3.3
There's no suspense
What do you want to do?
You won't fool me, will you
Then I'd better answer anonymously, or the jokes downstairs will be bad

When a cylinder with a height of 4dm is cut into two small cylinders, the surface area is increased by 18cm2, and the original volume of the cylinder is___ ．

4 decimeter = 40 cm, 18 △ 2 = 9 (square cm), 9 × 40 = 360 (cubic cm). Answer: the volume of the original cylinder is 360 cubic cm

1. 1 / 3 of a number is equal to 1 / 9, and 1 / 3 of another number is equal to 1 / 8. Find the difference between two numbers

1/9÷1/3=1/3,1/8÷1/3=3/8
1/3-3/8=-1/24

（M^2--2M-3）x^2-(M-3)x-1

The method is right
The solution of the first equation is - 1