How to divide left and right in the plan of primary school? There's a row of figures. What's on the left side of the square? What's on the right side? Here, our left or right side, or the left or right side of the figure? A little dizzy!

Your own

Mathematician's story 50 words urgent, soon
I've got it. Now, how can I get more of the Elven Masters Cup badge?

The epitaph of mathematicians some mathematicians devoted themselves to mathematics before they died. On their tombstone after they died, they engraved marks representing their life achievements. After Archimedes, an ancient Greek scholar, died in the hands of Roman enemy soldiers who attacked Sicily (before he died, he still said: "don't break my circle"), people commemorated him on his tombstone

Conversion between meter and kilogram
How to convert kilogram into meter and square meter! Please explain!

What application are you talking about?
Under normal circumstances, meter is the unit of length, kilogram is the unit of mass, can't convert each other!
But I guess what you mean is that it is transformed according to some properties of the object
For example: conversion of kilogram and meter of clothing fabric
Take the warp length of 1 meter on the fabric, and weigh the gram weight, that is, how many kilograms is 1 meter; there is no fixed conversion mode, only through sampling calculation
Generally speaking, woven fabrics are priced by meter; knitted fabrics are priced by kilogram;
For example, the warp length is 1 meter (the width of the fabric is 150 cm, or 1.5 m2 in square terms, which has nothing to do with the weight per square gram, just say it casually), the weight is 250 g, the weight per meter is 0.25 kg, and the unit price is 10 yuan / meter, which is 10 / 0.25 = 40 yuan / kg, It's 4 meters of fabric
If the conversion of knitted fabric is required, the warp length is 1m, the weight is 250g, the gram weight per meter is 0.25kg, and the fabric value is 40 yuan / kg, that is, 40 * 0.25 = 10 yuan / m
The above way may produce some loss, please control, generally within 1%
PS: the above method is more accurate, and the following method will produce large deviation in calculation, so it needs to do more than 10 times of average calculation for different positions of the disc
The other is to take the area of 0.01 square meter with the weight taking instrument, weigh it on the gram weight meter, and then calculate it. For example, the weight is 2G under the area of 0.01 m2, that is, 2 / 0.01 = 200g / m2, and then measure the width (latitude gate width) as 1.5m, and then calculate it as 200 * 1.5 = 300g / m. if the unit price is 10 yuan / m, then the unit price per kilogram is 1000 / 300 * 10 = 33.3 yuan / kg, It is: 33.3 yuan / kg = 3.33 meters

The bottom of an isosceles trapezoid is twice as big as the top. Divide it into four trapezoids with the same area and shape. Please have a try

According to the analysis, the drawing is as follows:

Which plane figures are axisymmetric in grade one to grade five? How many symmetrical axes are there? Please draw a picture!

Isosceles triangle, 1;
Equilateral triangle, 3;
Rectangle, 2;
Square, 4;
Isosceles trapezoid, 1

If x + 3Y + 5Z = 10,5x + Z + 3Y = 8, x + y + Z =?
If x + 3Y + 5Z = 10,5x + Z + 3Y = 8, then x + y + Z=
Indicate ideas

x+3y+5z=10,5x+z+3y=8
Two formula addition
6x+6y+6z=18
x+y+z= 3

If the direction of non-zero vector a and B is the same or opposite, then the direction of vector a plus vector B must be the same as that of vector A. does vector B have only one direction? Why

No
(1) When the directions of non-zero vectors a and B are the same, the directions of vectors a + B are the same as those of vectors a and B
(2) When the direction of non-zero vectors a and B is opposite, and the modules of vectors a and B are not equal, the direction of vector a + vector B is the same as that of the vector whose module is larger
When the direction of non-zero vector a and B is opposite and the modules of vector a and B are equal, vector a + vector B is a zero vector with arbitrary direction

As shown in the figure, ∠ ACB = 90 °, e, f are the points on AB, AE = AC, BC = BF, then ∠ ECF=______ ．

∵ AE = AC, BC = BF, ∵ AEC = ∵ ace = 180 °− A2, ∵ BFC = ∵ BCF = 180 °− B2, ∵ ECF = ∵ BCF + ∵ ace - ∵ ACB = 180 °− A2 + 180 °− b2-90 ° = 45 °, so the answer is: 45 °

The function FX is an odd function defined on R, and f (x + 1) = - 1 △ f (x). If f (x) = 2x in the interval (0,1), what is f (5.5)?

The period of F (x + 1) = - 1 △ f (x) is 2, because f (x + 2) = - 1 / F (x + 1) = - 1 / [- 1 / F (x)] = f (x), so f (5.5) = f (- 0.5) (period 2) = - f (0.5) (odd function) = - 2 * 0.5 (in the interval (0,1), f (x) = 2x) = - 1

If the dihedral angle α - L - β equals 120 °, a and B are two points on edge L, AC and BD are in the half plane α and β respectively, AC ⊥ L, BD ⊥ L, and ab = AC = BD = 1, then the length of CD equals ()
A. 2B. 3C. 2D. 5

∵ A and B are two points on edge L, AC and BD are in the half plane α and β respectively. The plane angle of AC ⊥ L, BD ⊥ L, and ∵ dihedral angle α - L - β is equal to 120 ° and ab = AC = BD = 1, ∵ CD = ac2 + AB2 + BD2 − 2Ac · BD · cos θ = 1 + 1 + 1 + 1 = 2, so C is selected

How to divide left and right in the plan of primary school? There's a row of figures. What's on the left side of the square? What's on the right side? Here, our left or right side, or the left or right side of the figure? A little dizzy!