Half times the square of 5.7 - 5.7 times 3.7 + half times the square of 3.7

Half times the square of 5.7 - 5.7 times 3.7 + half times the square of 3.7

It is equivalent to 1 / 2A ^ 2-AB + 1 / 2B ^ 2, that is, 1 / 2 (a ^ 2-2ab + B ^ 2), i.e. 1 / 2 (a-b) ^ 2. If a = 5.7 and B = 3.7 are brought in, 2 is obtained

With a simple algorithm, please help 37 * 24 + 74 * 38 32 * 62-64 750 * 43 + 430 * 25

37*24+74*38
=37*24+37*76
=37*(24+76)
=37*100
=3700
32*62-64
=64*31-64
=64*(31-1)
=64*30
=1920
750*43+430*25
=750*43+43*250
=(750+250)*43
=1000*43
=43000

A simple calculation of 25 times 43:37 plus 37 times 43:18
fast

=37/43(25+18)
=37/43X43
=37

Is 430 divided by 1.25 divided by 8 (simple operation) = 430 times 4 out of 5 times 1 out of 8 = 430 times 1 out of 10 = 43 a simple operation?

430 divided by 1.25 divided by 8 (simple operation) = 430 divided by 5 / 4 times 8 = 43

The research of geometry
1. Can you name the aggregate composed of cylinder and prism, cylinder and sphere, prism and sphere?
What about the composition of other geometric bodies?

Ballpoint pen core

What color is red, yellow and green

It's hard to say. First of all, the light of red, yellow and blue is gathered together and painted together with pigments of red, yellow and blue, and the effect is different. The more light is gathered, the brighter it appears, and the heavier the color is painted, the darker the mixed color will be, even black or close to black. Second, the same light of red, yellow and blue or pigments of red, yellow and blue, The final effect is different with different proportion. So simply speaking, what color is red, yellow and blue mixed together, there is no definite conclusion

How many centimeters is a 21 inch TV!
I have two old TVs in my family. It's almost eleven. I want to change them into better ones. Now, in the home appliance market, there's a new policy, which is to trade in old TVs for new ones. It's to buy a new one and sell it to him for 10% of the money. However, I don't know how many inches our old TVs are. How should we measure them?
If it's 21 inches, how many centimeters is it? If it's 25 inches, how many centimeters is it? Should it measure the diagonal of the screen? Or other parts of the screen? Don't measure the shell?
My family has iron tape measure and tape measure for clothes and trousers
So how much should one inch equal?

21 inches is 51 centimeters
25 inches is 64 centimeters
Measure the diagonal of the screen without measuring the shell. It's best to use an iron tape measure

The perimeter of a square and a circle is 12.56 cm. What are their respective areas?
Please list the formula

Square area: (12.56 / 4) * (12.56 / 4)
Circle area: [(12.56 / 3.14) / 2] ^ 2 * 3.14

How to calculate the average speed? How to bring the formula into the formula

Average speed = (speed 1 + speed 2) / 2

How many square meters is 18 square minutes

0.18