Mathematical problem Uncle Wang welded a square frame with 120 cm long iron wire. What's the volume of the square frame? The formula

Mathematical problem Uncle Wang welded a square frame with 120 cm long iron wire. What's the volume of the square frame? The formula

What is the edge length of a cube
120 △ 12 = 10 (CM)
What is the volume of a cube
10 × 10 × 10 = 1000 (CC)

4x-1 of X-1 = 8 of 1-1-x

This is a problem of fraction calculation,
The left and right sides of the equation are multiplied by X-1 at the same time
4x-1 / X-1 * X-1 = 1 * X-1 + 8 / X-1
4X-1=X-1+8
4X-X=-1+8+1
3X=8
X=8/3

From 15 cm, 8 cm wide rectangular cardboard
Remove the square with the side length of 2 cm from the four corners of the box, and then fold it into a rectangular box. How many cubic centimeters is the volume of this box? (fast!)

If you draw a picture, you can see it at a glance! Originally, the length and width are 15, 8, and four legs are cut off to form a cuboid. The length is 15-2 * 2 = 11, and the width is 8-2 * 2 = 4. The height is the side length of the small square line cut off: 2, so the cuboid volume is 11 * 4 * 2 = 88

Using in Physics_____ To show the speed of the movement of an object, its size is equal to the speed of the moving object____ Passed within_____

In physics, speed is used to express the speed of an object. Its size is equal to the distance of a moving object in unit time

If the absolute values of 4x ^ n, y ^ 4 and m ^ 2, x ^ 2Y ^ M-N are all binomials of degree 6 about X and y, and the coefficients are equal, find the value of M and n

Because | m ^ 2 x ^ 2Y ^ M-N | is a monomial, so n = 0
And because m and N are constants
So m = 4

If it is known that the developed side view of a cone with generatrix length 2 is a sector with center angle of 90 degrees, then the bottom radius of the cone is?

1 / 2 L = n * r / 180, n = 90, r = 2, l = *, 2 * r = *, r = 1 / 2

How to check the equation?
For example: 50x = 100 50x / 50 = 100 / 50 x = 2 test: how to check?
Our teacher seems to say that: left side of the equation = 50 * 2 = right side of the equation? (I don't remember) = 100, right~

Count in the second generation
The left side of the equation is 50x = 50 × 2 = 100
100 on the right
Both sides are equal
The result is correct

It is proved that: √ [(x1-x2) ^ 2 + (y1-y2) ^ 2] + √ [(x2-x3) ^ 2 + (y2-y3) ^ 2] > = √ [(x1-x3) ^ 2 + (y1-y3) ^ 2], X and y are real numbers

Construct three points a (x1, Y1) B (X2, Y2) C (X3, Y3)
Obviously, when ABC is collinear, there can be ab + BC = left = AC = right
When a, B and C are not collinear, then a triangle can be formed with left = AB + BC > AC = right
So the inequality holds

The diameter of the small circle is equal to 1 / 3 of the radius of the large circle, the perimeter ratio of the small circle to the large circle is (), and the area ratio of the large circle to the small circle is ()

The diameter of the big circle is six times that of the small circle, the perimeter ratio of the small circle to the big circle is (1:6), and the area ratio of the big circle to the small circle is (36:1)

A times 5 out of 6 = B times 3 out of 2 = C times 4 out of 5 = D times 3 out of 8, what are the rules of these numbers, how to arrange the size order, and how to arrange ABCD four numbers

Let them all equal to the unit
a=6/5
b=2/3
c=5/4
d=8/3
Pass and share
a=72/60
b=40/60
c=75/60
d=160/60
So d > C > a > B