Love lasts a lifetime

In order to gain time, complete the following teaching tasks on time.

He Yu continued:"When calculating the angle between two straight lines, when the slope k1-k2 of the two straight lines is zero.

Li Juan has already said that this will only happen when the two straight lines are parallel or coincident. This situation.

Now let's study it again.

If we don't need the absolute value symbol in the calculation, can we also directly calculate the positive value of tanθ?

Does anyone know?

Please stand up and speak!"

As soon as He Yu finished speaking, Li Juan stood up He stood up and said:"This is very simple. Just subtract the small slope from the large slope to get the positive value of tanθ.

When calculating, ignore the absolute value sign in the textbook. You can throw it away.

I don't know what I said. Is that right?

If you disagree with what I said, please ask a wise male student to stand up and refute."

This amazing action of Li Juan surprised the leaders and teachers who came to listen to the class!

A young teacher who came to attend the class quietly asked a classmate sitting in the back row:"Does this female classmate usually get good grades?

Does she want to perform?""

"certainly not!

Her academic performance is average"

‘Is that really weird?

His grades are average, but he can answer questions that people would never expect.

Usually, even when I am teaching, I ask my classmates to calculate according to the formulas in the textbook.

If He Yu hadn't taught her secretly, she would never have dared to think of doing this? 'The young teacher was thinking to himself.

Li Juan saw that no one stood up to answer. Still standing.

He Yu asked,"Is there any classmate who rebutted?"

The class was still silent.

He Yu said,"Li Juan's answer made me really admire her!

Everyone knows that her academic performance is average, but today she didn't expect that she could come up with such an important calculation method.

I wonder what everyone knows." Thoughts?"

……

"Is it because you don’t want to say it or don’t want to say it?

Silence means consent!

What she just said was not arrogance, but a kind of courage!

She dared to throw away the absolute value symbols that experts who wrote textbooks had used in calculation formulas for many years.

I would venture to say that she reminded us that we should not be slaves to teaching materials, but should be masters over knowledge.

I don’t know if it’s because of my arrogance or because of classmate Li Juan’s performance today?

Ask students to comment."As soon as He Yu finished speaking, the whole class applauded enthusiastically!

What does this mean?

Only the classmates knew, and the teacher who came to listen to the class just stared!

An old teacher felt baffled; 'This He Yu is really How audacious and arrogant!

How dare you say in front of so many people that experts who have written textbooks have smashed and thrown away the absolute value symbols that have been used in calculation formulas for many years, and called on students not to be slaves to textbooks, but to be slaves to knowledge. Master.

I have never seen that teacher dare to openly despise the experts who wrote the teaching materials in class. The students applauded indiscriminately?

It is really puzzling!"

He Yu said to the students:

"Thank you students for your support and understanding!

I was deeply moved.

Next, I put three questions on the blackboard and asked three students to come up and do them according to the methods in the textbook.

The other students followed the instructions of Li Juan in their own exercise books."

He Yu asked three questions on the blackboard and asked three students to come up and do one question each.

In just a few minutes, the students who came up to do the questions quickly completed the questions asked by He Yu.

The students below also It was done quickly.

He Yu asked:"Do the students below have any questions that they can't solve? If so, please raise your hands!"

I'll guide you to do it"

…….

Really; if you dare to speak freely and accuse experts in public, you are taking the courage of a leopard.

Just waiting for people to comment.