A math club has a "mysterious" accounting method. When they earn 200 yuan, it is recorded as - 180; when they use 200 yuan, it is recorded as 220. Guess, when they use 100 yuan, it may be recorded as how much? When they earn 100 yuan, it may be recorded as how much? Tell me your reason

A math club has a "mysterious" accounting method. When they earn 200 yuan, it is recorded as - 180; when they use 200 yuan, it is recorded as 220. Guess, when they use 100 yuan, it may be recorded as how much? When they earn 100 yuan, it may be recorded as how much? Tell me your reason

Income of 200 yuan can be recorded as + 200, but it can be recorded as - 180 - (+ 200) + 20 = - 180
Similarly, the second is: expenditure 200 is recorded as - 200, and the formula is: - - 200) + 20 = 220
The expenditure of 100 yuan is - (- 100) + 20 = 120
Income 100 yuan, (+ 100) + 20 = - 80
When there is no income or expenditure, it can be recorded as - 0 + 20 = 20
That's it!

There is a secret accounting method in the math club, which members all know: when the income is 360 yuan, it is recorded as + 200 yuan, and when the income is 120 yuan,
Record it as minus 40 yuan. If you spend 300 yuan, how should you keep the account? How did you find out the secret? No, I want it now!

This is the coordinate. Take positive 160 yuan as the zero point, so the expenditure of 300 yuan should be recorded as - 460 yuan

A factory has a secret way of accounting. When they earn 300 yuan, it is recorded as - 240 yuan; when they use 300 yuan, it is recorded as 360 yuan. Guess how much yuan they may record when they use 100 yuan? When they earn 100 yuan, how much is it? Give me your reasons

∵ the difference between the income of 300 and 240 is 60, and the difference between the income of 300 and 360 is 60. Therefore, the income of 100 yuan is recorded as 100 + 60 = 160 yuan, and the income of 100 yuan is recorded as - (100-60) = - 40 yuan

A math club has a "secret" accounting method. When they earn 300 yuan, it is recorded as "- 240 yuan". When they use 300 yuan, it is recorded as "+ 360 yuan". Guess how much yuan they may record when they earn 100 yuan? How much yuan they may record when they use 100 yuan? Tell me your reason

-40

3 / 10 (200 + x) - 2 / 10 (300 + x) = 300x9 / 25, find X
By the way, the topic should be 3 / 10 (200 + x) - 2 / 10 (300-x) = 300x3 / 25

3/10(200+x)-2/10(300+x)=300×9/25
Take 10 on both sides
600+3x-600-2x=1080
x=1080

Solving the equation requires detailed calculation process; 3 / 10 (200 + x) - 2 / 10 (300-x) = 300 * 9 / 25

3/10(200+x)-2/10(300-x)=300*9/25
Multiply both sides by 50
15(200+x)-10(300-x)=300*9*2
Remove brackets
3000+15x-3000+10x=5400
Merge congeners
25x=5400
Removal coefficient
x=216

7x-5/4=3/8;2x-1/6=5x+1/8;x-1/2+1=x-1;3/10(200+x)-2/10(300-x)=300x9/25;2y-1/3=y+2/4-1;3/4[4/3(1/2...
7x-5/4=3/8;2x-1/6=5x+1/8;x-1/2+1=x-1;3/10(200+x)-2/10(300-x)=300x9/25;2y-1/3=y+2/4-1;3/4[4/3(1/2x-1/4)-8]=3/2x+1

14x-15=3 x=9/7; 8x-4=15x+3 x=-1;x-1/2=1 x=3;600+3x-600+2x=300x18/5 x=12*18=216;2y-1/3=y+2/4-1 8y-4=3y+6-12 5y=-2 y=-2/5(1/2x-1/4)-6=3/2x+1 1/2x-3/2x=7+1/4 -2=14x+x/2 -4=29x x=-4/29

Calculation: (1 / 300) ^ - 1 / 2 + 10 * (√ 3 / 2) ^ 1 / 2 * (27 / 4) ^ 1 / 4-10 * (1 / 3) ^ - 1
Urgent,,,, seek expert,,, speed

(1/300)^-1/2+10*(√3/2)^1/2*(27/4)^1/4-10*(1/3)^-1=(300^-1)^-1/2+10*(3^1/2*2^-1)^1/2*(3³*2^-2)^1/4-10*(3^-1)^-1=300^1/2+10*3^1/4*2^-1/2*3^3/4*2^-1/2-10*3=300^1/2+10*3^(1/4+3/4)*2^(-1/2-1/2)-10*3=...

The sports bureau organizes 12 teams to participate in the football match
(1) First, 12 teams are divided into three groups. No two teams in each group have to play a game. How many games in the group game?
(2) How many teams are there in the second round?
(3) Enter the second round of the team, no two teams have to play a game, determine the champion and runner up a total of how many games

If he was divided into three groups on average, he would do it
12 △ 3 = 4
Four groups compete six times
The top two are two in the next round, and the four groups are eight
Eight teams play 28 Games
The calculation method is: (n × (n-1)) / 2
For example: eight teams have to play 28 Games (8 × (8-1)) / 2 = 28

The scoring rule of football match is to win 3 points, draw 1 point, lose 0 point. There are 10 games in total. The team plans to get at least 23 points. The team must win at least several games to achieve the goal

Let (10-x-y) field 3x + y = 23, so y = 23-3x, 10-x-y = 10-x - (23-3x) = - 13 + 2x, because 0 ＜ x ＜ 10, 0 ＜ y ＜ 10, 0 ＜ 10-x-y ＜ 10, so 0 ＜ x ＜ 10, 0 ＜ 23-3x ＜ 10, 0 ＜ - 13 + 2x ＜ 10, so 6.5 ＜ x ＜ 23 / 3, because X and y are integers, so x = 7, so at least 7 games are won