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The first question is relatively simple, the key is to have the idea of "substitution", the * in the question no longer means the multiplication sign, but the symbol that gives special meaning, and the same kind of problem also uses special symbols such as triangles, you just need to substitute the following values into the operation according to the previous algorithm.

Purely equations. 2*（-3）=2a-3b=5

1)*2= -a+2b=8 3 (eight-thirds, you should put the denominator behind, otherwise it looks like two and three-two, with fractions and false fractions combined?) ）

It can be solved from the above two equations to obtain a=18;b = 31 3 (ten and a third).

So 1*6=18+31 3=28 and one-third.

The second question only needs to consider the angle.

Each angle of a regular triangle is 60 degrees, that of a square is 90 degrees, and that of a regular dodecagonal is 150 degrees.

Divide 360 by all angles to get4

Therefore, 6 triangles and 4 squares can be directly paved, while 12 sides need to be divided.

For details, please refer to the geometry textbook for the second year of junior high school (remember to be) about angles.

The additional question is similar to the first question, but the plus sign is changed to a multiplication sign.

What you get:

2*（-3）=2a*（-3b）=5

1)*2=-a*2b=8/3

This gives -6ab=5

6ab=5 is probably my calculation error, and the product of ab is actually different.

You calculate it yourself according to this, hint: after the product of ab is determined, 1*6 becomes 6ab can be directly concluded, there is no need for two formulas at all, maybe you copied the problem wrong, maybe I understood it wrong, or I solved it wrong, but the basic idea is already clear, let x=1, y=6 ......In this way, it is enough to substitute the numerical calculation.

Power of 4 = 4

Power of 8 = (2 3).

Because it is greater than. So the power of 4 is greater than the power of 8.

As shown in the figure below, the basic integral is made using the basic integral formula.

Question 1. In the quadrilateral ABCD, A= C=90O and the sum of the inner angles of the quadrilateral is 360°

abc+∠adc=180°

BE and DF are divided equally between ABC and ADC, respectively

ebc+∠fdc=90°

and EBC+ BEC=90°

fdc=∠bec

be df (equal isotope angles, two lines parallel).

Parallel, since adc+ abc=180 so adf+ebf=90 degrees afd+ adf=90 degrees so afb= ebf so parallel.

1) In quadrilateral ABCD, A= C=90°, and the sum of the inner angles of the quadrilateral is 360° ABC+ ADC=180°

BE and DF are divided equally between ABC and ADC, respectively

ebc+∠fdc=90°

and EBC+ BEC=90°

fdc=∠bec

be df (equal isotope angles, two lines parallel).

2) The sum of the inner angles of the n-siden: (n-2) 180° is a 15-sided shape (because n-2=13).

Another number of internal angles: 2340°-2220°=120°

It's very simple, first of all, calculate the workload, 35 * 18 = 630 people, because it takes 3 days in advance, then, 18-3 = 15, it takes 15 days to complete, and then use 630 15 to get the number of people needed 42 people, 42 minus the original 35, so add 7 people.

So understood. It was originally planned to be completed in 18 days for 35 people.

Then the total amount of work is 35*18=630

3 days in advance, then the number of working days is 15 days.

So how many people are needed?

Then you need to add 42-35 = 7 people.

Set: add x people, from the meaning of the title:

35*18=(18-3)*(35+x)

So: 3 days earlier you need to add 7 people.

630=15*(35+x)

42=35+xx=7

The degree of each inner angle.

Each outer angle + adjacent inner angle = 180 degrees.

So each outer angle ===180*2 7=360 7 outer angles and = 360 degrees.

So there are 7 outer corners.

It is a 7-sided shape. The sum of its internal angles is (7-2)*180=5*180=900 degrees.

its edges. Let the inner angle be x

Because the inner angle + outer angle = 180 degrees (i.e. flat angle).

So there is x+2 5x=180 to get x=900 7 degrees.

Let the number of sides be n, which is obtained by the sum of the inner angles of the polygon.

n-2)*180=900 7*n, the solution is n=7

Inner angle: 900 7 °

Number of Sides: 7 Process: Solution: Let each inner angle be x°

x+2x/5＝180°

x＝900/7°

Let the number of sides be n180°(n-2) n 900 7n 7Answer: Each inner angle of this multi-sided row is 900 7°, and the number of sides is 7 Note: " is the division sign.

The ergonomic ratio of the two is: 1 5:1 9=9:5

Master processing: 168 (9+5) 9=108 (pcs).

Apprentice processing: 168-108 = 60 (pcs).

In 45 minutes, the master processed 9 pieces, and the apprentice processed 5 pieces, a total of 14 pieces.

So a total of 45*12=540 minutes.