Someone has a secret way of keeping accounts. When the income is 500 yuan, it is recorded as - 140. When 500 yuan is used, it is recorded as 360. If 0 is recorded in the account, do you think this is () There's another reason

Someone has a secret way of keeping accounts. When the income is 500 yuan, it is recorded as - 140. When 500 yuan is used, it is recorded as 360. If 0 is recorded in the account, do you think this is () There's another reason

Someone has a secret way of keeping accounts. When the income is 500 yuan, it is recorded as - 140. When 500 yuan is used, it is recorded as 360. If 0 is recorded in the account, do you think it is (income is 220 yuan)

A math club has a secret way of keeping accounts. When they earn 100 yuan, it is recorded as - 90. When they use 100 yuan, it is recorded as + 110
How much is it when you go to 300 yuan? How much is it possible to record when there is no income or expenditure? Give reasons.

Income of 100 yuan can be recorded as + 100, but it can be recorded as - 90 - (+ 100) + 10 = - 90. Similarly, the second is: expenditure of 100 is recorded as - 100, the formula is: - (- 100) + 10 = 110, expenditure of 300 yuan is - (- 300) + 10 = 310, no income and no expenditure can be recorded as - 0 + 10 = 10. That's it! Look at me so hard! And

A math club has a "secret" accounting method. When they use 300 yuan, it is recorded as - 240; when they earn 300 yuan, it is recorded as + 360
Don't copy,
When they spend 100 yuan, how much is it possible? When the income is 100 yuan?

Set the bookkeeping method as rule a
When 300 yuan is used, it is recorded as - 240, a-300 = 240
When the income is 300 yuan, it is recorded as + 360 as a + 300 = 360
A=60
The accounting method is 60 + income or 60 - expense
When 100 yuan is spent, it is - 40, and when 100 yuan is earned, it is + 160

Fill in the brackets with the appropriate number 197 - () = () ()

（9）（8）（9）（9）；（9）（9）（9）（8）.

1 / 2 + 1 / 4 + 1 / 8 + +1:128 + 1:256 simple calculation, explain the reason?

In the normal case, the molecule is 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1, which is 256-1 out of 256

1. (7 / 1) one seventh (2x + 14) = 4-2x 2, (10 / 3) three tenths (200 + x) - (10 / 2) two tenths (300-x) = 300 times 9 / 25
It's right to solve the linear equation of one variable

One seventh (2x + 14) = 4-2x 2x + 14 = 7 (4-2x) 2x + 14 = 28-14x2x + 14x = 28-1416x = 14x = 14 △ 16x = 7 / 8 (10 / 3) three tenths (200 + x) - (10 / 2) (300-x) = 300 times 9 / 25 times 103 (200 + x) - 2 (300-x) = 108600 + 3x-600 + 2x = 1085x = 108x = 108 △ 5x = 21.6

How about three quarters x + 300 = ten ninths x?

Transference
10 / 9 x - 3 / 4 x = 300
13 / 36 x = 100
X = 100 △ 13 / 36
X = 276 and 12 / 13

3 / 10 (200 x) - 2 / 10 (300 x) = 9 / 300x25

How to solve the problem of 200 out of x = x + 300 out of 10

200/x=300/（x+10）
300x=200x+2000
100x=2000
x=20

3/10(200+x)-2/10(300-x)=300X9/25

3 / 10 (200 + x) - 2 / 10 (300-x) = 300x9 / 25
3×20+3x/10-2×30+2x/10=12×9；
5x/10=108；
x/2=108;
x=216;
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