8x = 9 × (x-4) to solve the equation, I want the whole process thank you

8x = 9 × (x-4) to solve the equation, I want the whole process thank you

8x=9x-9×4
transposition
9x-8x=9×4
x=36

Solve the equation 16 (8x + 4) - 4 = 9 (6x + 3), the value of X

128x+64-4=54x+27
128x-54x=27-60
74x=-33
x=-33/74

6x0.3 + 15% x = 2.38x (x-0.6) = 2.3

6x0.3+15%x=2.3
1.8+0.15x=2.3
0.15x=0.5
x=10/3
8x（x－0.6）=2.3
8x-4.8=2.3
8x=2.3+4.8
8x=7.1
x=71/80

A physics problem: as shown in the figure, the power supply voltage remains unchanged. The range of the ammeter is 3a, and the resistance R2 = 12 Ω
When s is closed and slide slide p to the midpoint of the sliding rheostat, the indication of the ammeter is 1.5A. When slide P slides to the rightmost point B, the indication of the ammeter is 1a. Calculate: 1. The maximum resistance of the sliding rheostat; 2. Power supply voltage; 3. The minimum resistance of the sliding rheostat in the circuit

Let's tell the two resistors whether they are in parallel or in series. Later, we found that they should be in series, or the current will exceed the load unless there are other conditions. The following is the process of solving the problem. Suppose that the maximum resistance of sliding rheostat is r, and the voltage is UU / (12 + R / 2) = 1.5u / (12 + R) = 1. Solve the equation u = 36, r = 24, because the maximum allowable current is 3a36

A natural number can be written as the product of two different prime numbers

A natural number can be written as the product of two different prime numbers. This natural number has [innumerable]

Two resistors of 10 ohm, 1.5A and 15 ohm, 1A are connected in series in the circuit, and the voltage at both ends of the circuit shall not exceed__ How much v?
It's a series circuit. Explain why

The voltage should not exceed 25V. If two resistors are connected in series, the maximum current should not exceed the rated voltage and current of each resistor

If the chord a B is a parabola y 2 = 8 x through Q (4,1), and Q is the midpoint of the chord, the equation of the straight line a B is obtained

Let a (x1, Y1), B (X2, Y2) then Y12 = 8x1y22 = 8x2 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; subtract the two expressions to get (Y1 + Y2) (y1-y2) = 8 (x1-x2), so 〈 Y1 − y2x1 − x2 = 8y1 + Y2, and & nbsp; & nbsp; Y1 + Y22 = 1 〉 KAB = 4 linear AB equation: Y-1 = 4 (x-4) & nbsp; namely & nbsp; 4x-y-15 = 0

How much influence does the temperature have on the resistance of the coil?
For example, when the temperature is 25 ℃, the rated resistance value is required to be 225 Ω. Then, when the temperature drops to 15 ℃, how many Ω should its resistance value be qualified?

Very big
The resistance of the coil generally increases with the increase of temperature
Specific resistance value to temperature conversion formula and coefficient
It depends on the environment of the coil
The general conversion formula is as follows
R2=R1(T+t2)／( T+t1)
Where R1 and R2 are the resistance values at T1 and T2 respectively;
T -- constant for calculation, 235 for copper conductor and 225 for aluminum conductor

1. Throw an object upward from the ground at the speed of 10m / s. After XS, the height of the object above the ground (unit: m) is the square of 10x-4.9x. How long does it take for the object to fall back to the ground (accurate to 0.01s)?
two
After two price cuts, the price of a drug is reduced to half of the original price. It is known that the percentage of two price cuts is the same. Calculate the percentage of each price cut (accurate to 1%)
(solved by a primitive quadratic equation)

1. Because after XS, the height of the object from the ground (unit: m) is the square of 10x-4.9x, so the height h = 10x-4.9x ^ 2. This is a quadratic function. When x = 5 / 4.9, the function has the maximum value. At this time, the object reaches the highest point, so 5 * 2 / 4.9 = 2.04. When the object falls back to the ground after 2.04 seconds, let's set the price reduction XA * (1-x) ^ 2 every time

When the power ratio of a and B is 1:2 and the power on time ratio is 3:4, the power consumption ratio is ()
A. 1：2B. 3：8C. 3：4D. 2：3

The ratio of electric energy consumed by a and b electrical appliances is w a W B = p a t a P B T B = 12 × 34 = 38