[4 / 3x - (2x / 3-1 / 2)] = 5 / 4x

[4 / 3x - (2x / 3-1 / 2)] = 5 / 4x

4/3x-2/3x+1/2=5/4x
5/4x-4/3x+2/3x=1/2
(15-16+8)/12x=1/2
x=6/7

15-2x=3x+30

The original equation is changed to 3x + 2x = 15-30
The combined result is 5x = - 15
If the coefficient is 1, x = - 3

There is an electric cooker with heat preservation function. The data in the table below are collected from its manual. The rated voltage is 220 V and the heating power is 880 W
Insulation Power 40W
Circuit diagram of electric rice cooker:
Two resistors are connected in series in a 220 V circuit, R2 is connected in parallel with the switch
Calculate the resistance value of R1 and R2

R1 55 Ω R2 1210 Ω

How to calculate the score addition and subtraction,
Step by step!

First of all, it is necessary to judge whether the denominators of two fractions are the same. If the denominators are the same, the numerators will add and subtract, and the denominators will not change. For example, 1 / 5 + 1 / 5 = 2 / 5. If the denominators are different, the least common multiple of the denominators of two fractions will be calculated, and the least common multiple will be added and subtracted as the denominator. For example, 1 / 5 + 1 / 2 = 2 / 10 + 5 / 10 = 7 / 10

There are 26 25W electric lamps installed on the 220 V circuit, and the fuse of the circuit is blown. But for the fuse with 1A rated current, how to connect it?
Please give an answer
Twenty six 25W electric lamps have been installed on the 220 V home circuit. Now the fuse on the circuit has blown. But we only have fuse with rated current of 1A on hand. How to connect? A: 2 in series. B; 2 in parallel. C; 3 in series. D; 3 in parallel. Please give the best answer and explanation

D: Three in parallel
The total power of 26 25W bulbs is 25W × 26 = 650W;
From P = UI, I = P / u;
So I total = P total / u
That is, I total = 650W / 220V ≈ 2.94545a = 2.9a
So the fuse should be at least 3a;
Then select D

As shown in the figure, a ladder with a length of 2.5m leans against the wall, the distance between the bottom of the ladder and the corner of the wall is 1.5m, and the distance between the top of the ladder and the ground is h______ Rice

In RT △ ABC, AB2 = ac2-bc2, ∵ AC = 2.5m, BC = 1.5m, ∵ AB = ac2 − BC2 = 2m, that is, the distance h between the top of the ladder and the ground is 2m

How to measure the electric power of electric appliance with electric energy meter

Turn off all the appliances in the house. Leave only the appliances under test. Then use a stopwatch to calculate the time. See how much electricity is consumed by the appliances in this period. Calculate the electric work according to w equals Pt

To explore the law, the square of 15 = 225 can be written as 100 × 1 × (1 + 1) + 25, and the square of 25 = 625 can be written as 100 × 2 × (2 + 1) + 15 conjecture (10N + 5)
Another question:
According to the above conjecture, calculate the square of 1995=__________ (write the process)

100n(n+1)+25

The resistance R1 and R2 are connected in parallel, and their equivalent resistance is 10 Ω. If R1 = 15 Ω is known, the equivalent resistance after R1 and R2 are connected in series is ()
It's a process

1 / R1 + 1 / r2 = 1 / 10, then R2 = 30
Resistance 30 + 15 = 45 after R1 R2 series connection

The arrangement of natural numbers is shown in the figure on the right: what's the eighth number from the left of the 100th? What's the number 2011 from the left?
one
2 3
4 5 6
…………

As can be seen from this figure, the beginning of each row of numbers is larger than that of the previous row, and it grows into an arithmetic sequence with 0 as the first term and 1 as the tolerance. The number of numbers in each row is equal to the number of rows. Then the number at the beginning of each row can be expressed as 1 + n (n-1) / 2 by this formula. According to the above formula, the number from the left of the 100th row can be calculated