Who can give me 20 questions of binary linear equations and 20 questions of unitary linear equations? Don't use questions! There must be a process! I want the process! No process, I don't!

(1) 66x + 17Y = 3967 25X + y = 1200 answer: x = 48 y = 47 (2) 18x + 23y = 2303 74x-y = 1998 answer: x = 27 y = 79 (3) 44x + 90Y = 7796 44x + y = 3476 answer: x = 79 y = 48 (4) 76x-66y = 4082 30x-y = 2940 answer: x = 98 y = 51 (5) 67x + 54y = 8546 71x-y = 5

Give 40 one variable first-order equations, 30 two variable first-order equations and 10 three variable first-order equations

In the triangle ABC, ad is perpendicular to BC, be is perpendicular to AC, BC is equal to 18, AC is equal to 12, ad is equal to 6, find the length of be

Idea: the area of the same figure can be expressed in different ways, and can be marked with an equal sign
Because the area of △ ABC = 1 / 2 * ad * BC = 1 / 2 * ac * be
So ad * BC = AC * be
Namely: 6 * 18 = 12 * be
BE=9

How many meters is the ancient one?

In ancient times, Yizhang is about 2.3 to 2.4 meters as it is now

A rectangular playground with a length of 30 meters and a width of 20 meters should be doubled first, but the shape of the playground should not be changed. How many meters should the length and width be increased
(accurate to 0.1M) detailed process

First of all, we need to double its area, that is, expand it by 2 times, so the side length should be expanded by √ 2 times, which is about 1.414 times,
The available length should be increased by:
30x (1.414-1) = 12.42 (m)
The width should be increased by:
20x (1.414-1) = 8.28 (m)

If one internal angle of a triangle is equal to the difference between the other two, find the degree of the largest angle of the triangle

Let the three angles of a triangle be angles a, B and C
So there is angle a + angle B + angle c = 180 (1)
Angle a = angle B - angle c (2)
(2) By substituting (1), the angle B-angle C + angle B + angle c = 180
2 angle B = 180
Angle B = 90 degrees
A: the maximum angle of this triangle is 90 degrees
I'm glad to answer for you,

If x

(2x-8)-(2y-8)
=2x-8-2y+8
=2x-2y
=2(x-y)
x

Measuring the shadow length of trees or flagpoles, can you calculate the actual height of these objects

Of course, it can be calculated
First, measure the shadow length L of the tree or flagpole. Then, measure the shadow length L of the tree or flagpole. You can find its height H. from the triangle similarity knowledge, you can get H: l = h person: l person, so h = h person * L / L person

Primary school grade 6 English. Use the given words to ask questions in brackets
1.I'm (reading) a (story-book). (what)
2.He (tried to change China. (what)
3.He was (a famous historical person). (who)
4.You can visit (the Dr Sun Yatsen Memorial Hall). ( where)
5.I was born (in Guangzhou). (where)

1.what are you doing
2.what did he do
3.who was he
4.where can you visit
5.where were you born

x+1.5x+2=15_ How to solve the equation x = 5.2

x+1.5x+2=15
2.5x=15-2
x=13÷2.5
x=5.2

Who can give me 20 questions of binary linear equations and 20 questions of unitary linear equations? Don't use questions! There must be a process! I want the process! No process, I don't!