If x power of 12 = 3 and Y power of 12 = 2, what is the value of (1-2y) of 8 divided by (1-x + y) power?

12 ^ x = 3 ①, 12 ^ y = 2 ②. ① * ② = 12 ^ (x + 2Y) = 2 * 2 * 3 = 12, so x + 2Y = 1, so the original formula is equal to (1-2y) / 3Y of 8. Because ②, so 3Y of 12 is 8, 12 is equal to 1 / 3Y of 8, so the original formula is 1-2y of 8. Because ②, so 2Y of 12 is 4, because 1 of 12 is 12, so 1-2y of 12 is 12 / 4 = 3
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There is a festival lantern made of 20 small bulbs in series. If the current at the power plug is 200mA, then the current through each small bulb is 200mA______ mA．

Current law of series circuit: in series circuit, the current is equal everywhere. Because small bulbs are in series, the current is equal everywhere in the circuit, that is, the current passing through each small bulb is equal to the current at the power plug, which is 200mA. So the answer is 200

The rational number a B C D satisfies | ABCD | / ABCD = 1 to find the maximum value of | a | / A + | B | / B + | C | / C + | D | / d

|abcd|/abcd=1
When a > 0, b > 0, C > 0, d > 0, there is a maximum
|a|/a+|b|/b+|c|/c+|d|/d=1+1+1+1=4

One solar cell has an open circuit voltage of 0.55 V and a short circuit current of 1.3 a. the other solar cell has an open circuit voltage of 0.6 V and a short circuit current of 0.1 A. suppose that both solar cells obey the ideal diode law. When the two solar cells are connected in (a) parallel connection and (b) series connection, try to calculate the total open circuit voltage and short circuit current

a. The voltage is 0.6V and the current is 1.4A
B. The voltage is 1,15v and the current is 0.1A

1. The diameter of the driving wheel of a train is 1 meter. When the train is running, the driving wheel does not rotate 300 turns on average. How many kilometers does the train travel per hour?
2. Xiao Ming has some stamps. He gives more than half of them to Xiao Hong, and Xiao Hong gives him five. At this time, Xiao Ming has 50 stamps. How many did Xiao Ming have?
3. How many pieces does it take to lay a square with a 18 cm long and 12 cm wide colored floor tile?
4. Mom cooks by herself. The whole process includes: it takes 5 minutes to clean rice, 40 minutes to cook in an electric cooker, and 25 minutes to stir fry. In order to have dinner before 11:30, when will Mom prepare to cook at least?
5. A 1 / 2km long canal was built. On the first day, 1 / 24 of the total length of the canal was built. On the second day, 1 / 8 of the total length of the canal was built. How many parts of the total length are left?
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1. 300x3.14x1x60 = 56520m ≈ 57km2, (50-5 + 2) x2 = 94 sheets 3, [18,12] = 36,36 ／ 18 = 2 pieces, 36 ／ 12 = 3 pieces, 2x3 = 6 pieces, at least 6 pieces. 4. Wash rice first, and then cook in the electric cooker (washing and frying dishes are completed during the period, so it doesn't take extra time to wash and stir fry dishes), listed as follows: 5 + 40 =

Xiaoming used three ammeters (voltmeter or ammeter), two small bulbs, switch, wire and power supply to connect the circuit as shown in the figure to carry out the experiment. After closing the switch, the two bulbs all emit light. The readings of the three ammeters recorded by Xiaoming are: 6V; 1.5A; 0.5A
(1) Draw the circuit diagram of the experiment and point out the readings of a, B and C meters? (2) Calculate the resistance of ll and the total power consumed by the circuit

(1) A is an ammeter to measure the main circuit current, so the indication is 1.5A. B is to measure the current of bulb L1, the indication is 0.5A. C is to measure the power supply voltage, the indication is 6V. From the power supply, through the switch and the rear branch of ammeter a, one is to return to the negative pole through bulb L2, one is to return to the negative pole through ammeter B and bulb L1, and the other is to return to the negative pole directly through the voltmeter, as shown in the figure: (2) the current of L1 Resistance R1 = UI, B = 6v0.5a = 12 Ω, the total power consumed by the circuit P = UI = 6V × 1.5A = 9W. Answer: the resistance of ll is 12 Ω, the total power consumed by the circuit is 9W

Half X - {2x - two thirds Y & # 178;} + {- two thirds x + one third Y & # 178;}, where x = - 2, y = two thirds

Half X - {2x - two thirds Y & # 178;} + {- two thirds x + one third Y & # 178;}
=1/2x-2x+2/3y²-2/3x+1/3y²
=y²-13/6x
=(2/3)²+13/6x2
=4/9+13/3
=43/9

What's the relationship between molar mass, Avogadro constant, mass of matter, and the formula between them

The molar mass is the mass per mole of the substance. For example, the molar mass of H2 is 2G / mol
The mass of a substance is equal to the number of moles of the substance multiplied by the molar mass
For example, the mass of 3molh2 is 3mol * 2G / mol = 6G Avogadro constant, which is the number of particles per mole of the substance: 6.02 * 10 ^ 23
That is: every 2G hydrogen molecule is equal to 1mol hydrogen molecule, equal to 6.02 * 10 ^ 23 hydrogen molecules

Define an operation "", for n ∈ n, satisfy the following operation properties: ① 2 2 = 1; ② (2n + 2) * 2 = (2n * 2) + 3. Then the value of 2004 * 2 is______ ．

∵ (2n + 2) * 2 = (2n * 2) + 3, that is, 2 (n + 1) * 2 = 2 (n * 2) + 3, ∵ 2 * 2 = 1; 4 * 2 = 2 × (1 + 1) * 2 = 2 * 2 + 3 = 46 * 2 = 2 × (2 + 1) * 2 = 4 * 2 + 3 = 78 * 2 = 2 × (3 + 1) * 2 = 6 * 2 + 3 = 10 Therefore, 2004 * 2 = 2 (1001 + 1)) * 2 = 3 × 1001 + 1 = 3004

The voltage of a lamp with a resistance of 12 Ω is 6 V when it works normally. If it is connected to an 8 V circuit, how large a resistance should it be connected in series? (it is required to draw the circuit diagram and mark the relevant physical quantities on the diagram)

According to Ohm's law, the current in the circuit: I = IL = ulrl = 6v12 Ω = 0.5A, ∵ the total voltage in the series circuit is equal to the sum of the partial voltages, ∵ the voltage at both ends of the series resistor: ur = u-ul = 8v-6v = 2V, the resistance value of the series resistor: r = URI = 2 V0.5a = 4 Ω. A: it needs to be connected in series with a 4 Ω resistor. The circuit diagram is shown in the figure above

If x power of 12 = 3 and Y power of 12 = 2, what is the value of (1-2y) of 8 divided by (1-x + y) power?