A polyhedron with six vertices and twelve edges is -- a polyhedron, or what?

A polyhedron with six vertices and twelve edges is -- a polyhedron, or what?

Vertex number + face number - edge number = 2 = 6 + X-12 = 2, so the polyhedron is an octahedron

Fill in the table according to the number of faces, vertices and edges of the polyhedron shown in the figure below. What rules do you find?

I found no content

What are the rules of the number of faces, vertices and edges of polyhedron

There are only five kinds of regular polyhedron: tetrahedron, octahedron, icosahedron, hexahedron and dodecahedron
Application in polyhedron
There is a relationship among the number of vertices V, the number of faces F and the number of edges e of a simple polyhedron
This formula is called Euler's formula. It describes the special rules of vertex number, face number and edge number of simple polyhedron

How to calculate 60% x + 35% x = 125 with equation solution?

0.6x+0.35x=125
0.95x=125
x=125÷0.95
X = 131 and 11 / 19

0.435x16+56.5x0.16
It's not an equation, it's a simple calculation

0.435x16+56.5x0.16
=0.435*100*0.16+56.5*0.16
=0.16*(43.5+56.5)
=0.16*100
=16
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Ink is x yuan, pen is 1.2 yuan, a total of 4 yuan, equation and checking, how to calculate?

x+1.2=4
x =4-1.2
x =2.8
Substituting x = 2.8 into the original equation
Because 2.8 + 1.2 = 4
So x = 2.8 is the solution of the original equation

What should we pay attention to when checking the equation?

Well, 1. Both sides should be equal
2. Substitute x into the original equation
There's nothing else to pay attention to

What is the reason why the addition and subtraction of fractions with different denominators can not be directly added and subtracted
I can't figure out what it is!

The units of points are different

If the denominator of a fraction is different, it means that () is different and cannot be added or subtracted directly. First () is transformed into () fraction, and then () is calculated according to () rule
fast

The denominator of a fraction is different, that is, the unit of fraction is different. It can not be added or subtracted directly. First, it should be converted into a fraction with the same denominator, and then it should be calculated according to the law of fraction addition and subtraction

The addition and subtraction of fractions with different denominators requires () to be converted into () the same fraction

The addition and subtraction of fractions with different denominators must first be converted into fractions with the same denominator