In the Black Riding Valley, the second elder has a high status.

To the west of the Black Riding City, there is a magnificent palace, the Hall of Famous Soldiers.

Every seven days, the Second Elder Council would go to the Martial Arts Hall to give lectures and teach the art of war, and anyone could go and observe.

At other times, the Second Elder would live in seclusion in a lakeside cottage three miles away from the Black Horse City, and devote himself to studying the art of war in this place, which outsiders call the 'Soldier's House'.

When Zhang Qi arrived at the soldier's house.

In the distance, he saw a man in white standing alone on the edge of the lake fishing, and not far away was a grass hut. In the Black Riding Valley, where black is the main color, the man in white looks a little out of place.

"This should be the Second Elder."

Zhang Qi looked at the white-clothed people fishing by the lake, he had already inquired from Xu Zhi that the only person in white in the Black Riding Valley was the second elder.

"I heard that the second elder is not very good-tempered."

Zhang Qi raised his feet and walked towards the man in white by the lake, thinking about what to say after meeting......

Just halfway through.

The man in white, who was fishing by the lake, suddenly threw away the fishing rod in his hand and lamented to the lake: "I have been in a cage for ten years, when will I be able to return home......

Hearing this, Zhang Qi couldn't help but stop, looking surprised.

What do you mean?

Why did the second elder make such a sigh full of resentment?

It seems to have come at a bad time.

He turned and prepared to leave, coming back another day.

"Stop."

After only a few steps, Zhang Qi heard a cold scolding sound coming from behind, and as soon as he turned around, he saw the second elder dressed in white striding towards him.

The Second Elder was much younger than he had imagined.

He looks like he is in his thirties, with a beard under his chin, elegant appearance, and gentle temperament, but there is a strong sense of gloom in his eyes.

"Junior Zhang Qi, I have seen the second elder."

Zhang Qi stood in place and bowed to the second elder who was walking quickly.

The second elder squinted his narrow eyes, stared at Zhang Qi, and asked in an unkind tone, "What did you hear just now?" ”

"I ......"

Zhang Qi was about to deny it, but when he saw the second elder's domineering appearance, he felt that this matter was only afraid that it would not be good, so he changed his mind, took a step forward, and said in a low voice:

"Second Elder, you don't want me to spread what I just heard, do you?"

“……”

The second elder stared at Zhang Qi with wide eyes, and for a while, he didn't know how to respond.

Apparently.

He didn't expect that Zhang Qi would dare to oppose the guest and threaten him in turn.

This moment.

Thoughts crossed his mind.

It's all because he was homesick just now and accidentally said what was in his heart.

The complaint just now would have been heard by others, but if that person knows......

The Second Elder couldn't help but shudder.

"You're so daring!"

The Second Elder picked up the Elder's shelf and sneered, "However, it would be too naïve for you to threaten Elder Ben with this. ”

"The elder misunderstood."

Zhang Qi said truthfully: "The juniors came to visit today, just to take a little dispatch from the second elder and make money to support themselves, that's all." ”

"Oh?"

Hearing this, the second elder's heart moved, his eyes turned around Zhang Qi, and asked, "Do you know the art of war?" ”

Zhang Qi shook his head: "I don't understand." ”

The second elder said with a cold face: "I don't understand the art of war, why did I come to Elder Ben?" ”

"If you don't understand, you can learn."

Zhang Qi said with a serious face: "As long as the second elder is willing to teach, the juniors will soon be able to learn." ”

"What a big breath."

When the second elder heard this, he almost laughed angrily.

The art of war, inclusive of all things, strange and positive, infinite changes, is not something that a cat or a dog can learn.

It is necessary for a man of great wisdom to enter this door.

When he was about to reprimand, Zhang Qi suddenly asked, "I wonder if the second elder is interested in arithmetic?" ”

"Arithmetic?"

The second elder was slightly stunned.

Arithmetic, also known as mathematics, was one of the six arts of gentlemen in the Great Zhou Dynasty, and almost every noble child had to learn one. After all, if you don't even know how to do the math, then how can you manage your land and property?

In daily life, arithmetic is used in field surveying, city construction, money and goods trading, and so on. In military affairs, arithmetic is even more important, whether it is topographic survey or marching formation, it is inseparable from arithmetic.

It can be said that every master of the art of war is a master of arithmetic.

The second elder stared at Zhang Qi, who was unashamed, and couldn't help but say, "Could it be that you still know how to do arithmetic?" ”

Zhang Qi said bluntly: "In this world, no one understands better than me. ”

"Huh."

The second elder laughed and shook his head, as if he had heard something extremely ridiculous.

"That book of elders will test you."

"Please."

Half an hour later, the second elder had a ghostly expression on his face.

He came up with six arithmetic problems in a row, but this kid named Zhang Qi just wrote some ghost drawing symbols on the ground with his fingers, and then in the blink of an eye, he answered the correct answer.

To know.

There was one problem that he calculated for a day and a night before he came up with the final result.

But this kid only took half a stick of incense...... Not yet.

"What kind of witchcraft is this?"

The second elder suppressed the shock in his heart, stretched out his hand and pointed to the 'ghost drawing talismans' on the ground, thinking that Zhang Qi was using the power of ghosts and gods.

"It's not witchcraft."

Zhang Qi pointed to the mathematical symbols and formulas on the ground and said, "This is equations, plane analytic geometry, and calculus ......."

The second elder's mouth opened slightly, and he looked confused.

Zhang Qi looked at the second elder with a confused and shocked expression, and said with a smile: "If the second elder wants to learn, I can teach you." ”

"What!"

The second elder's body shook, and he looked at Zhang Qi blankly.

Half an hour later.

He said with a complicated face: "From now on, I will teach you the art of war, and you will teach me arithmetic." Privately, we associate with each other as equals. ”

Only then did Zhang Qi know that the original second elder's surname was Xu, and he had a show.

I happened to be thirty years old this year.

At the invitation of the second elder Xu Xiu, Zhang Qi came to his military house, originally to sit for a while.

As a result, one sitting is a day.

It wasn't until it was dark that Zhang Qi was put back by the reluctant Xu Xiu.

If you put it in the previous life, the second elder Xu Xiu is definitely a university bully, and Xu Xiu will learn these mathematical knowledge from later generations, and he will also bypass the analogy, draw inferences from one another, and ask Zhang Qi several times.

Zhang Qi finally realized that teachers are not so easy to be.

He taught Xu Xiu mathematics, and Xu Xiu taught him the art of war.

Pity.

Unlike Xu Xiu, who already has a good foundation in mathematics, he has no foundation in the art of war, and Xu Xiu can only teach him from scratch by hand.

With such treatment, it's definitely scorpion in Black Riding Valley-

It's the only one.

When leaving, Xu Xiu also gave him a few military books and asked him to read more books when he had time.

Return to the Blackstone Lodge.

Zhang Qi found that on the stone table in the house, there was suddenly a black box.

Walk over and open it to take a look.

Boy.

The box was full of clematis, and they were all high-grade clematis.

"This taste...... Good right! ”

Zhang Qi tasted it, and after making sure that it was correct, he couldn't help but show surprise.

Who sent this grass?