A teaching building is 80 meters long and 60 meters wide. Draw the floor plan of the building with a scale of 1:2000 A piece of advice triangle win money King 2222

A teaching building is 80 meters long and 60 meters wide. Draw the floor plan of the building with a scale of 1:2000 A piece of advice triangle win money King 2222

80 △ 2000 = 0.04m = 4cm 60 △ 2000 = 0.03m = 3cm
Just draw a rectangle 4 cm long and 3 cm wide

If the ratio of the three internal angles of a triangle is 1; 2:3, then the three internal angles of the triangle are equal to ()

30 degrees, 60 degrees, 90 degrees

Square of X (x-1) - 2x (square of x-x + 1)

Original form
=x^3-x^2-2x^3+2x^2-2x
=-x^3+x^2-2x
=-x(x^2-x+2)
=-x(x-2)(x+1)

The playground is 102 meters long and 48 meters wide. There are cypress trees in the four corners of the playground. The distance between two adjacent trees is 3 meters. Two roses are planted between two trees. How many trees are planted around the playground

Cypress = 2 × (102 + 48) △ 3 = 100
Rose = 100 × 2 = 200
One person = 100 + 200 = 300 trees

What is capillary phenomenon in life, production or experiment

Capillarity refers to the phenomenon that the liquid inside the tube changes due to the difference of surface tension and adhesion and overcoming the gravity. Towel absorbs water and groundwater rises along the soil are all capillaries
There are many examples of capillarity in nature and daily life. The tube in the plant stem is the very fine capillary in the plant, which can absorb the water in the soil. Brick water absorption, towel sweat absorption, chalk ink absorption are common capillaries. There are many small channels in these objects, which act as capillaries

(x+5)*3/10=1/5x+5
It's a fifth of an X

x×3/10+5×3/10=1/5x+5
3/10x+3/2=1/5x+5
3/10x-1/5x+3/2=5
1/10x+3/2=5
1/10x=5-3/2
1/10x=7/2
x=7/2÷1/10
x=7/2×10
x=35
3 / 10 means three tenths, right? I'm not sure

A classroom is 12 meters long and 8 meters wide. It should be drawn () cm long and () cm wide on a 1:300 scale plan

A classroom is 12 meters long and 8 meters wide. It is drawn on a 1:300 scale plan. The length should be (4) cm and the width (8 / 3) cm

Xinhua Bookstore promotes the sales by the way of "10 yuan book margin membership card enjoys 10% discount on book purchase". Do you think the purchase of books exceeds the purchase price______ Yuan to do membership card book cost

The answer is: x-90% X ≥ 10, the solution is: X ≥ 100, that is to say, it is cost-effective to buy books with membership card if the purchase of books exceeds 100 yuan

How to convert the unit of knitted fabric

Knitted fabrics generally use gram weight, that is, gram / square meter as the unit of measurement
If you know the gram weight and width of the fabric, you can multiply the extension meter
For example, a kind of sweatcloth weighs 160 grams per square meter and has a width of 1.80 meters. How many meters can one kilogram produce?
It's 1 divided by 1.80, then divided by 0.16, and the result is that
Conversely, if you ask how many kilos a meter has, it's the same: one meter multiplied by 1.8 meters multiplied by 0.16

The large right angle trapezoid is divided into four small right angle trapezoids of the same size
Trapezoid bottom is 10 cm, height is 10 cm, bottom is 20 cm, it is divided into four equal size right angle trapezoid

That's it~