Please help the teachers.

The above formula can be split into (a 2-10*a+25) + (b 2-24b+144) + (c 2-13b+169) = 0

Then the simplification will have (a-5) 2+(b-12) 2+(c-13) 2=0

And because (a-5) 2>=0, and the last two items are not written in the same way, so a=5, b=12, c=13.

The square of 5 plus the square of 12 equals the square of 13. So it's a right triangle.

This kind of problem is generally to disassemble and assemble the given formula, and make a few similar ones to know what characteristics the edges of various triangles are.

Solution: A 2 + B 2 + C 2-10A-24B-26C + 338 = 0A 2-10A) + (B 2-24B) + (C 2-26C) + 338 = 0A 2-10A + 25) + (B 2-24B + 144) + (C 2-26C + 169) = 0

a-5) 2+(b-12) 2+(c-13) 2=0So, a=5, b=12, c=13

Because they satisfy the Pythagorean theorem.

So there is the RT triangle abc

The formula can be formed into (a-5)2+(b-12)2+(c-13)2=0, so a=5, b=12, c=13, according to the Pythagorean theorem, it is known as a right triangle.

What is the problem on campus, can you make it clearer?

The Pythagorean theorem.

The square of a plus the square of b is equal to the square of c.

So just change the style a little bit.

Solution: A 2 + B 2 + C 2-10A-24B-26C + 338 = 0A 2-10A) + (B 2-24B) + (C 2-26C) + 338 = 0A 2-10A + 25) + (B 2-24B + 144) + (C 2-26C + 169) = 0

a-5) 2+(b-12) 2+(c-13) 2=0 solution yields: a=5, b=12, c=13 (because positive numbers only 0 plus 0 plus 0 equals 0) because: they satisfy the Pythagorean theorem.

So: the triangle ABC is a right triangle.

1) The heat emitted by the complete combustion of natural gas:

qput=vq=

2) Heat absorbed by water: Q absorption = cm (t-t0) = transport tank (kg?).100kg (70 -20) = bridge accompaniment.

3) The efficiency of the burning-side tung gas stove: =q suction q discharge 100%= 100%=60%.

Answer: (1) The heat emitted by the complete combustion of natural gas is;

2) The amount of heat absorbed by water is;

3) The efficiency of the gas stove is 60%.

Boil water with a natural gas stove and burn the natural gas so that 100kg of water rises from 20 to 70. The specific heat capacity of water is known to be c="4"Potato HillThe calorific value of 2 103J (kg) natural gas is Q=. Seeking:

1) The heat released by the complete combustion of natural gas is discharged;

2) water absorbs heat Q absorption;

3) The efficiency of the gas stove.

Analysis] The heat released by the complete combustion of natural gas can be calculated from q discharge = vq; The heat absorbed by water can be found by the formula q absorption=cm (t-t0); The efficiency of a gas stove is calculated by the ratio of the heat absorbed by the water to the heat emitted by the complete combustion of natural gas

1) The heat released by the complete combustion of natural gas q=qv=. ...(2 points) 2) The amount of heat absorbed by water.

Q suction = cmδt ="4" .2×103j/（kg•℃）100kg×（70℃-20℃）=。The attacker ......... late2 points).

3) The efficiency of the gas stove =q suction q discharge =. ...Shoot Li .........2 points) Answer] 1).

60 plus 40 equals 100 100 multiplied by two equals 200 40 times 4 equals 160 200 plus 160 plus 48 equals 408 centimeters.

Stationery boxes are measured in centimeters.

The unit of measuring the building is meters.

300 centimeters = 3 meters.

1 meter is about 6 pencils long.

Two. Refrigerator about 80 cm. Hope.

It seems that you don't understand the definition. Thevenin's theorem, also known as the law of equivalent voltage sources, is an electrical theorem proposed by French scientist L. C. Davenin in 1883. Because as early as 1853, Helmholtz also proposed this theorem, so it is also called the Helmholtz-Thevenant theorem.

It is that the two ends of a linear network containing an independent voltage source, an independent current source, and a resistor can be electrically equivalent to a combination of a series resistor of an independent voltage source v and a relaxed two-terminal network in terms of its external form. In single-frequency AC systems, this theorem applies not only to resistors, but also to generalized impedances.

Thevenin's theorem has important applications in the analysis of complex DC circuits with multiple power supplies and multiple circuits.

Thevenin's theorem: A linear resistive single-port network n with a separate power supply can be equivalent to a single-port network with a voltage source and resistors in series in terms of port characteristics. The voltage of the voltage source is equal to the voltage UOC of the single-port network when the load is open; The resistor r0 is the equivalent resistance of the single-port network n0 obtained when all independent power supplies in the single-port network are zero.

It's better to ask the classmates who are better at studying in your class. Or just ask your teacher.

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Is this a circuit diagram? I haven't done it for a long time, it's good, I can teach you, we're really different, I'm very happy, we're happy, we're progressing, we're very good and strong, I'm Buddha, I'm coming step by step, we're going to be happy, we're happy, we're happy, we're really happy, we're really strong, we're really going to get up, we're really good, you're worth it.

Lan Lan is 86 meters from home to school, Cong Cong is 48 meters from home to school, and the two are subtracted by 86-48 = 38 meters.

(1)5×8=40

A: Mom works 40 hours a week.

A: Mom needs to work 48 hours a week this week.

(1) Mom works every week:

5x8=40 (hours).

Mom worked 40 hours a week.

2) Mom works this week:

8x(5+1)

48 (hours).

Mom works 48 hours a week.