Four small squares with sides of one centimeter can spell out three different shapes. What's the circumference?

Four small squares with sides of one centimeter can spell out three different shapes. What's the circumference?

Perimeter of a = 2 * (2 + 2) = 8 cm, perimeter of B = 2 * (4 + 1) = 10 cm, perimeter of C = 2 * (3 + 2) = 10 cm

There are four cylindrical wooden columns in the school corridor. The perimeter of the bottom is 9.42 decimeters, and the height is 3 meters. What's the volume of these columns? What's the speed

Bottom circumference = 2 π R, so r = 9.42 / 2 / 3.14 = 1.5 decimeter = 0.15 meter
Volume = bottom area * height = 3.14 * 0.15 * 0.15 * 3 = 0.21195m3
For 4 columns, 0.21195 * 4 = 0.8478m3

What kind of operation symbol and bracket should be added in the middle of 5 0.3 to make the result equal to 0

（0.3-0.3）*0.3*0.3*0.3=0

What is the relationship between the existence and continuity of partial derivatives, differentiability, function continuity and existence of partial derivatives?

Differentiability must be continuous and partial derivatives exist
Continuity is not necessarily the existence of partial derivatives, and the existence of partial derivatives is not necessarily continuous
Continuity may not be differentiable, and the existence of partial derivatives may not be differentiable
A sufficient and unnecessary condition for the continuity of partial derivatives to be differentiable

If a is the number of opposite numbers equal to its own number, B is the number of square numbers equal to its own number, and C is the number of cubic numbers equal to its own number, then a + B + C

The opposite of a = 1 0 is 0
The square of B = 20,1 is equal to 0,1
c=3 -1、0、1
∴a+b+c=1+2+3=6

Four four plus, minus, multiply and divide equals 6 or 20?
4 4 4 4=6
4 4 4 4=20
This is not the question of the exam!

（1）4＋〔4＋4〕÷4＝6
(2) It's hard to think of [4 △ 4 + 4] × 4 = 20

As shown in the figure, the image of the first-order function Y1 = - 5x + 20 and y2 = 3x intersects at point P. according to the information given in the figure, the solution of the equations 5x + y = 20 and 3x-y = 0 is () P (2.5,7.5)

Y = - 5x + 20, that is, 5x + y = 20
Y = 3x, that is, 3x-y = 0
So the solution of the system of equations is a set of (x, y) which satisfies two equations at the same time
The coordinates of the intersection of two functions satisfy the requirements of two functions at the same time
So the intersection coordinates are the solutions of the equations
That is, x = 2.5, y = 7.5

Divide a cube with a surface area of 96 square meters into two identical cuboids. How many square meters is the sum of the surface areas of the two cuboids?

One side of a cube is 96 △ 6 = 16 square meters
Divided into two, two faces are added
So area sum = 96 + 16 + 16 = 128 square meters

3-5, 7-13 count as 24 points
It's negative, negative 5 and negative 13

（（-5）*（-13）+7）/3=24

Sketch method for finding function image y = x ^ 1 / LNX

I don't know the true face of Lushan Mountain, only because I am in it
Simplify, the truth will be revealed to the world
x>0,x≠1
1/lnx=lne/lnx=logx(e)
Y = x ^ (1 / LNX) = x ^ (logx (E)) = e, (logarithmic identity) x > 0, X ≠ 1
The image is an open ray parallel to the x-axis and the distance from the x-axis is equal to E. in the first quadrant, the point (1, e) is deleted