x: 5 = 1 △ 3 x 18 = 10 / 3 / 5

x: 5 = 1 △ 3 x 18 = 10 / 3 / 5

x:5=1÷3
3x=5
X = 5 / 3
18 out of 10 = 5 out of 3 out of 10
18：x=50:3
50x=54
X = 27 / 25

1. In a store, the cost of a certain kind of pants is increased by 5%, then the price is marked, and then the pants are sold at a 20% discount. As a result, the profit of each pants is 10 yuan. How much is the cost of each pants?
2. The interest rate of a one-year fixed deposit is 2.25%, and the income interest is subject to interest tax of 20%. It is known that a depositor has a one-year fixed deposit, and the income interest is 405 yuan when due. How much principal does the depositor deposit?
3. For a section of highway, Party A will finish it in 15 days, Party B will finish it in 10 days, and team a will finish it in 5 days, and then two teams will finish it together. How many more days will it take?
4. There are 200 tons of coal in warehouse A and 80 tons in warehouse B. If warehouse a transports 15 tons a day and warehouse B transports 25 tons a day, after X days, the storage of coal in the two warehouses is equal, find X
When you answer these questions, you must write down all the steps, the solutions and the settings! Be tight
The first question is 50 percent! Not 5 percent
Oh, I'm sorry

1. The design cost is x yuan,
Formula: 0.8 (1.5x) - x = 10
The solution is x = 50 yuan
2. Set the principal as X Yuan
Formula: X * 2.25% * 80% = 405
The solution is x = 22500 yuan
3. The daily workload of Party A is 1 / 15, and that of Party B is 1 / 10
If Party A and Party B work together, the daily work quantity is (1 / 15) + 1 / (10) = 1 / 6
First, Party A does 5 days, that is, 1 / 3 of the work quantity is done, and 2 / 3 of the work quantity is left
It will take X days to complete the design
（1/3）÷X=1/6
The solution is x = 2
4. According to the meaning of the title, make a list
200-15X=80+25X
The solution is x = 3 days

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x（x-1）=30
x（x-5）=300
3x^2-5x-50=0
0.5 (x-1) ^ 2 = one third (x ^ 2-1)
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Crazy

X (x-1) = 30, x = 6 or x = - 5
X (X-5) = 300, x = 20 or x = - 15
3x ^ 2-5x-50 = 0, x = 5 or x = - 10 / 3
0.5 (x-1) ^ 2 = one third (x ^ 2-1) x = 1 or x = 5

After the household power of 220 V becomes 24 V, can the inverter be changed back to 220 V for energy-saving lamps?

Yes, it can. The commonly used ones are 12V to 220, 24V to 220, 48V to 220, 60V to 220,
There are a variety of power options, 100W, 150W, 300W, 500W, 1000W and so on
Example: 100W inverter can supply 4 25W lamps or 11 9W lamps
25*4=100 ,9*11=99 ,
For 12V to 220V, it costs about 85-110 yuan for 150W and 120-150 yuan for 300W,

25/（）=0.625

25/（40）=0.625

The resistance value of resistance R1 is 5 ohm. The current intensity of main circuit current is 0.5 a. the voltage at both ends of resistance R2 is 2 v. R1 and R2 are connected in parallel. Calculate the resistance value through R1 and R2
The current intensity, and the resistance of R2

Because R1 and R2 are in parallel, their voltage is 2 V, so the current through R1 is I1 = u / R1 = 2 / 5 = 0.4 a,
The current passing through R2 is I2 = I total-i1 = 0.5-0.4 = 0.1 a,
From R2 = u / I2, R2 = 2 / 0.1 = 20 Ω

Simple calculation questions grade 5 8.9 * 9.9 0.02 * 38.7 * 50 1.25 * (8 + 0.8)

8.9*9.9
=8.9*(10-0.1)
=89-0.89
=88.11
0.02*38.7 *50
=38.7*0.02*50
=38.7*1
=38.7
1.25*（8+0.8）
=1.25*8+1.25*0.8
=10+1
=11

There is a meter g, internal resistance Rg = 25 Ω, full bias current Ig = 3mA, which is refitted into an ammeter with measuring range I = 0.6A. What is the resistance R in parallel? What is the internal resistance Ra of the modified ammeter?

The resistance value of parallel resistance: r = igrgi − Ig = 0.003 × 250.6 − 0.003 ≈ 0.13 Ω, the internal resistance of the modified ammeter: RA = igrgi = 0.003 × 250.6 = 0.125 Ω; a: if G is modified into an ammeter, a 0.13 ohm resistance R should be connected in parallel, and the internal resistance Ra of the modified ammeter is 0.125 ohm

1 × 5 of 8, 1 + 3 of 3-8, 7 + 1 of 8

1 / 8 × 5
=5 out of 8
3-1 / 8 + 3
=6-1 / 8
=55 out of 8
7 + 1 / 8
=7 and 1 / 8
=57 out of 8
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