The teacher analyzes the wrong questions, thank you, and asks for the wrong questions, thank you

It's all preposition practice, it's a little blurry, I can't see it clearly.

The second step of your calculation is wrong, and this is an equation, not an equation. You can score points, but you can't multiply each item by two. You do the math again and you get the correct answer.

The root sign, a mathematical symbol, is used to denote the opening operation of a number or an algebraic formula, which is denoted by " ", and the number or algebraic formula that is squared is written in the area surrounded by the symbol and cannot be out of bounds.

If a = b, then a is the nth root of b to the nth power or a is the 1 nth power of b.

In ancient times, the Egyptians used the mark " " to indicate the square root. When Indians open the square, they write ka in front of the number of squares to be opened. Arabs use .

Around 1840, the Germans used a dot to represent the square root, two dots to the fourth power, and three dots to the cube root.

For example, 3, 3, and 3 represent the square root, 4th power root, and cubic root of 3, respectively. By the beginning of the sixteenth century, probably because of the speed of writing, the dot had a slender tail on it, and it became " In 1525, in his algebraic writings, Lotdolph first used the root number, for example, he wrote 4 is 2 and 9 is 3, but this writing is not universally recognized.

The penultimate step. The subtraction here, the root number 5 minus the root number 5 by 6 times the root number 5, should be minus 5 times the root number 5. The relationship equivalent to 1-6=-5 should be carelessly ignored. The final answer is 5, not 1

The way this question is miscalculated, because the teacher can help you do it, so you have to make the wrong way according to this way.

You miscalculated this question very carelessly, and there was no problem in the front, but in the penultimate part, there was a little problem, as shown in the figure below.

After modifying it to a negative five-fold root number five, the correct answer should be.

The negative five-fold root number five divided by the negative root number 5 = 5.

The correct answer should be equal to 5

Why did I miscalculate this question? Ask the teacher to tell me what is wrong and correct why this question is wrong, the teacher will tell you and correct you, don't be unconvinced.

The previous calculation is -5 5, divided by -5, and the result is 5

It's simplified here, and it doesn't need to be so simplified.

Solution: If the lower bottom of the trapezoid is x cm, then the upper bottom is (x + 4) cm.

x+4+x）×12÷2=240

2x+4）×6=240

2x+4=40

2x=36x=18

Top bottom: 18 + 4 = 22

No, that's right, the area of the circle = 2 r= divided by equal to 6, 6 is the diameter, and the distance between the legs of the compass is the radius, so it is also divided by two, so it is 3. It's your teacher who miscalculated, you can bring it up to the teacher, I support you!!

That's right, you see: divide, it is equal to 6, 6 is the diameter, the distance between the legs of the compass is the radius, 6 divided by 2, it is equal to 3.

It should be the teacher who helped you correct your mistakes, but I'm actually a little confused, so I don't know if it's right or not.

That's right. Unless the teacher wants to mislead you. Unless something embarrassing happened to the teacher, and he was trying to make amends

That's right, is there a requirement for a decimal point or something?

That's right. Don't believe you can check. You'll know right away.

Well, it seems to be right......Are you in 6th grade?

Suppose the wave propagates to the right, and when the wave source particle is above the equilibrium position and moves downward, then time passes (n+1|4) t, Zheng Tan (n=0,1,2,3.... Then the particle at x=2 also passes through (n+1|).4) t, let n=0, the particle at x=2 is in a downhill slope shape, and the vibration direction meets the movement 1|4 T is at the lowest point and has an upward trend. The same is accelerating to the left.

Qin Zheng.