Judge the true proposition or false proposition and explain the reason

Apposition angle, that is, the same position, the two angles are on the same side of the third line, above or below the two lines being cut
"Internal" refers to the angle between the two straight lines to be cut; "internal" refers to the staggered angle on both sides of the third straight line
Left side, the other corner is on the right side of the third line)
The inner angle of the same side refers to the same side of the third line, and the inner angle refers to between the two truncated lines
In the eight angles formed by two straight lines being cut by the third straight line, there are four pairs of equal position angles, two pairs of internal stagger angles and two pairs of internal angles on the same side
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As shown in the figure: in two parallel lines, they are respectively located on the left and right sides of the third line. The angle between the upper parallel line and the third line + the angle between the lower parallel line and the third line is the internal stagger angle
In two parallel lines, on the same side of the third line, the angle between the upper parallel line and the third line + the angle between the lower parallel line and the third line is the inner angle on the same side
All above the parallel line, the angle with the third line or all below the parallel line, the angle with the third line is the apposition angle

According to the rule, add 2,3,9 / 2,27 / 4... What's the fifth number?

81/8
The common ratio is 3 / 2

How to measure the length of a ball of copper wire with balance and scale? Write down the measurement method and the expression of copper wire length

First weigh the mass m, then find a place in the copper wire, and use a scale perpendicular to the extension direction of the copper wire to measure its diameter D. since the density p can be obtained from the table, the length L = m / (p * 3.14 * (D / 2) 2)

Reading answers to the telescope
How to fill in the blank of the first paragraph is the question

1. Nostalgic homeland, vast sky
2. A long way back to Zhao
3. Think, think
4. Let the old general feel that the distance between Taiwan and the mainland is not far away, the mainland and Taiwan will become a family. At the same time, he also expressed his friends' sincere wish for the early reunification of the motherland

The least common multiple of two numbers is 120 and the greatest common factor is 4. How many groups are there?
Just say which groups! And which numbers!

First, factorize 120
2 * 2 * 2 * 3 * 5 = 120
If the greatest common factor is 4, then the two numbers must have 2 * 2 = 4
Then, the two numbers may be: 4 * 3 = 12, 4 * 2 * 5 = 40: 4 * 5 = 20, 4 * 2 * 3 = 24; 4 * 2 = 8, 4 * 3 * 5 = 60
3 groups

The quotient of 1. X divided by 4.2 is equal to the ratio of 3 / 5. The ratio of 2. X and 1 / 3 is equal to 4:3
Give high marks if you can answer! (right)

1) 4.2/x=3/5,x=7
2) x:(1/3)=4:3,x=4/9
3) 5:2=10:4

What is the inverse proposition of the proposition "if the squares of two numbers are equal, then the two numbers are equal"?

The so-called inverse proposition is to say it backwards! The original proposition is a false proposition
If two numbers are equal, their squares are equal
This is a true proposition,

Observe the number of this group: 1,8,27,64125 What's the 20th number? What's the rule?

The first number is the third power of 1
The second number is the third power of two
The third number is the third power of 3
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According to this calculation
The twentieth number is the third power of 20, which is 8000

X-Y = 7, x + y = 5

Title: X-Y = 7, x + y = 5
: X-Y = 7, --- x = 7 + y substitute it into x + y = 5. Have (7 + y) + y = 5, the solution is y = -- 1, substitute it into: X-Y = 7, --- have x = 6
Then xy = - 1x6 = - 6

On the type of linear equation with one variable
How many

1.2(x-2)-3(4x-1)=9(1-x)
2.11x+64-2x=100-9x
3.15-(8-5x)=7x+(4-3x)
4.3(x-7)-2[9-4(2-x)]=22
5.3/2[2/3(1/4x-1)-2]-x=2
6.2(x-2)+2=x+1
7.0.4(x-0.2)+1.5=0.7x-0.38
8.30x-10(10-x)=100
9.4(x+2)=5(x-2)
10.120-4(x+5)=25
11.15x+863-65x=54
12.12.3(x-2)+1=x-(2x-1)
13.11x+64-2x=100-9x
14.14.59+x-25.31=0
15.x-48.32+78.51=80
16.820-16x=45.5×8
17.(x-6)×7=2x
18.3x+x=18
19.0.8+3.2=7.2
20.12.5-3x=6.5

Judge the true proposition or false proposition and explain the reason