Pengcheng craftsmen rushed to make clothes and armor, Lu Bu took advantage of this time to set up a school, and planned to raise Taixue, of course, the news could not be hidden from Cao Cao, who had been paying attention to Xuzhou.

Knowing that Lu Bu had invited Liu Hong to Pengcheng to teach arithmetic, Cao Cao couldn't help but feel amused.

In the eyes of many scholars and heroes, arithmetic is not of much use to govern the world at all.

Lu Bu actually started a school at this time, and asked everyone to learn arithmetic, which made Cao Cao very puzzled.

He summoned Guo Jia, Xun You and others to the front of the hall.

Everyone sitting here were first-class staff members under Lu Bu.

Cao Cao's gaze swept around the faces of the crowd and asked them: "I got the news that Lu Fengxian recently set up a school in Pengcheng, although he also taught some strategies and ways to govern the world, but he did not focus on these, but also asked students to learn arithmetic and some seemingly useless things. What do you think he wants to do? ”

"Some of Lu Bu's recent actions are really incomprehensible." Guo Jia replied: "But arithmetic is the art of deduction, and he lets people learn arithmetic, which may really come in handy." ”

"What can arithmetic be used for?" Cao Cao was very puzzled by Guo Jia's statement.

"Most of the world's affairs are inseparable from arithmetic." Guo Jia said: "The thunderbolts and crossbows that I presided over earlier needed to be calculated in order to achieve the effect of shooting the air force. ”

When Guo Jia spoke, Cao Cao stroked his beard, and a solemn look appeared on his face.

If the same thing were said by someone else, Cao Cao might still disagree, but when the words came out of Guo Jia's mouth, Cao Cao couldn't help but take it to heart.

Brushing his beard and muttering for a while, Cao Cao asked Guo Jia, "What does Fengxiao mean that Lu Bu plans to produce more whimsical and obscene things in the future?" ”

"I don't know if the lord has heard that in addition to inviting Liu Hong to Pengcheng, Lu Bu also ordered Yan Xiang to go to Xiliang?" Guo Jia asked.

Cao Cao's face was even more solemn than before: "Xiliang doesn't seem to be a person who is proficient in arithmetic, but I heard that Yan Xiang went, but I didn't expect what he could do there." ”

"He went there for Ma Jun." Guo Jia said: "Ma Jun is proficient in mechanical skills, but he is not treated by the Ma family in Xiliang, and his life is very unpleasant. As long as Lu Bu promised him some benefits, presumably Ma Jun would agree to go to Pengcheng. ”

Having realized the seriousness of the matter, Cao Cao asked Guo Jia: "If Ma Jun arrives in Pengcheng, will Lu Bu make some more things that look like they fly in the sky?" ”

"I'm afraid it's going to be more refined than those." Guo Jia replied: "Although Ma Jun hasn't made those, he is good at tricks, as long as he looks at it twice, he will definitely be able to make it." Since he wants to build it, it must be more suitable for the battlefield than what Lu Bu has built. I think it's more appropriate for the lord to send someone to Xiliang. ”

"The war with Lu Bu is imminent, so it's not easy to send people to Xiliang." Cao Cao said: "It's better to let people find out Yan Xiang's movements, and when he returns with Ma Jun, he will intercept and kill in the middle of the road, what does Feng Xiao think?" ”

"The lord thinks it's appropriate." Guo Jia replied: "It's just that you have to keep an eye on Yan Xiang, but you can't let him avoid the eyes of the lord." When Ma Jun arrives in Pengcheng, he will definitely bring a lot of trouble to the lord. ”

"Let's put this matter down for now." Cao Cao said: "I invited you here to discuss a war with Lu Bu. Do you think I should strike first, or should I be prepared and wait? ”