(x / 16) - 2 = (X-2) / 19 how to solve this?

(x / 16) - 2 = (X-2) / 19 how to solve this?

(x-32)/16=(x-2)/19
19 * (x-32) / (16 * 19) = 16 * (X-2) / (19 * 16) general score
19 * (x-32) = 16 * (X-2)
19x-19*32=16x-16*2
19x-608 = 16x-32 merge congeners
19x-16x=-32+608
3x=576
x=192

How to solve 16 + x = 9 / 19 (36 + x)

16+X=9/19（36+X）
19(16+x)=9(36+x)
304+19x=324+9x
19x-9x=324-304
10x=20
x=2

X + 12% x = 48.16 solution; 120% x = 48.16 x = 48.16 * 120% x =?

120% of the building owner is not right, if calculated by 112%, x = 43

How to solve the equation of (x + 20) * 3 / 4 = 120?

(X+20)*3/4=120
x+20=120x4/3
x+20=160
x=140

The cost of buying a car is 100000 yuan. The annual insurance, road maintenance and gasoline costs are 9000 yuan. The maintenance costs of the car are 2000 yuan in the first year and 4000 yuan in the second year. The number of years of scrapping the car increases year by year in an equal difference sequence. That is to say, the average cost of using more than one year is the least

If the service life is x years, the total cost of insurance, road maintenance and gasoline is 9x yuan, and the total maintenance cost is 0.1X + 0.2x ^ 20000 yuan. Therefore, the average annual cost is y = (10 + 0.9x + 0.1X + 0.2x ^ 2) / x = (10 + X + 0.2x ^ 2) / X
The derivation of Y is y '= (0.1 x ^ 2-10) / x ^ 2. If y' = 0, x = 10 can be obtained
So 10 years is the best

If the height of a cylinder is shortened by 6cm, its surface area will be reduced by 75.36cm2 and its volume will be reduced______ Cubic centimeter

The radius of the bottom surface is: 75.36 △ 6 △ 3.14 △ 2 = 2 (CM), so the reduced volume is: 3.14 × 22 × 6 = 75.36 (cm3). A: the volume is reduced by 75.36 cm3. So the answer is: 75.36

In the picture, the earth, moon and sun are in the position of () eclipse

It's a solar eclipse. That's right. Because the moon blocks the sunlight, there will be solar eclipses in the part blocked by the moon, that is, the sunlight is blocked. There will be partial solar eclipses and annular solar eclipses in some areas

In the building construction site, "tower crane" is a common lifting equipment, as shown in the figure is the schematic diagram of "tower crane". Suppose that the motor nameplate of a tower crane is marked with: rated voltage 380V, rated power 38KW, coil resistance 0.4 Ω. When lifting a heavy object at one time, the motor works normally for 20s, and the heavy object is lifted for 20m (1) (2) the heat generated by the coil during the operation of the motor. (3) the total amount of electrical energy converted into mechanical energy in the lifting equipment. (4) if the mechanical efficiency of the lifting equipment is 80%, what is the gravity of the lifted object?

(1) As the motor works normally, the power consumed is equal to the rated power, i.e. P = 38KW = 3.8 × 104w, and the working time t = 20s, the electric energy consumed by the motor is: w = Pt = 3.8 × 104w × 20s = 7.6 × 105J; (2) the current consumed by the motor during normal operation: I = Pu = 3.8 × 104w = 100A; the heat produced by the coil: q = i2rt = (100a) 2 × 0.4 Ω × 20s = 8 × 104j; (3) the heat consumed by the current Electric energy W1 = q = 8 × 104j, the total amount of electric energy converted into mechanical energy is wtotal = w-w1 = 7.6 × 105j-8 × 104j = 6.8 × 105J; (4) because η = w, wtotal = ghwtotal, i.e. & nbsp; 80% = g × 20m6.8 × 105J, the solution is g = 2.72 × 104n. Answer: (1) the electric energy consumed by the motor in the process of lifting heavy objects is 7.6 × 105J. (2) the heat generated by the coil during the operation of the motor is 8 × 104j. (3) in the lifting equipment, the total amount of electric energy converted into mechanical energy is 6.8 × 105J. (4) if the mechanical efficiency of the lifting heavy objects is 80%, the heavy objects will be lifted 72 × 104n

After three squares of the same size are put together into a rectangle, the circumference of the rectangle is reduced by 60 cm compared with the sum of the circumference of the original three squares. What is the original area of each square?

60÷4=15
15 × 15 = 225 square centimeter

12,4,8 least common multiple 15,4,3 least common multiple 7 / 8 + 1 / 7-3 / 8 = (simple operation)

The answer to the first question is: 24
The answer to the second question is: 60
The answer to the third question is: 7 / 8-3 / 8 = 4 / 8, then subtract 1 / 7 = 5 / 14
In the first two questions, the way to find the least common multiple is to use the multiple of the largest number to try, starting from multiplying by 1, and then you can find it. For example, the first question is to use 12 times 1, 2, 3. Keep trying, when 2 is OK, then 24 is the least common multiple