Halfway up the mountain, Kangyin residence. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

Backyard, in the gazebo.

Kang Yin was drinking tea, looking at the calm pond in the gazebo, and a fine light flashed in his eyes.

"Whoa!"

The water rippled, and a carp suddenly jumped up from the surface of the lake. Under the golden sun, the scales of the fish shone brightly, shining with dazzling light.

"Is the fish leaping over the dragon gate? Ha, it's really interesting. ”

Kang Yin let out a low groan, rubbing the teacup in his hand, and a look of interest appeared on his face.

"Step! Trample! ”

Soft footsteps came from the hallway.

The beautiful figure came to the gazebo.

With a shallow smile on the corner of her mouth, Kang Xue sat down in front of Liu Xuan and said quickly: "Father-in-law, Liu Xuan defeated Kangde." At that time, a strange thing happened. The archer brought by Kant released the arrow, and the arrow shot at Liu Xuan's body, but Liu Xuan was unharmed. In addition, Liu Xuan defeated Kant with one move, and his martial arts are also very powerful. ”

Kang Yin's dark color remained unchanged, and he said unhurriedly: "This is not unusual, if Liu Xuan has practiced hard skills, or has practiced foreign horizontal kung fu, he can resist ordinary swords, guns, feathers and arrows." A bow and arrow are not crossbow arrows, and it is normal to be blocked due to insufficient strength. ”

Kang Xue pouted and said: "Liu Xuan is the eldest son of Liu He, King of Kang, and he was born in a noble family. He is pampered with fine clothes and food, and he can practice external skills to such a degree, which shows that it is not simple. Maybe you might lose this time. ”

A crisp laugh came out of Kang Xue's mouth.

Kang Yin put down the book in his hand, sighed, shook his head, and said: "The adopted daughter is not a lady, the daughters of other people's families are all on the side of the family and cheering for the family." The old man's daughter wishes her father would lose. The world is declining, and morality is declining. ”

Having said that, Kang Yin had a smile in his eyes.

Liu Xuan passed Kant's level, which surprised him a little, and things were interesting.

Kang Xue held Kang Yin's arm and said angrily: "The father-in-law is always like this, and he doesn't understand his daughter's good intentions at all. The daughter said this because her stepfather was too idle and boring. Liu Xuan is here, you finally have a goal. Losing to Liu Xuan this time, you can regain your fighting spirit and prepare for the next battle. Your life is too lonely, and you have something to do when you have an opponent. ”

Kang Yin stroked the beard under his chin and praised: "Xue'er's words are deeply passed on by the old man. ”

Kang Xue rolled her eyes and said, "You really can boast, don't be ashamed." ”

Kang Yin looked serious and said, "Xue'er, your illness is not light. ”

Kang Xue said: "I'm in good health"

Kang Yin shook his head and said, "Being too honest is also a disease." You're just too honest. The words were like a sword, piercing into the old man's heart. It's a disease that needs to be treated. Next time, remember to change it. ”

Kang Xue threw out another roll of her eyes, pouted, and said, "My father-in-law is really boring." Father-in-law, the next level is an arithmetic problem. Guess how long it will take for Liu Xuan to come up with the answer? ”

Kang Yin smiled: "The old man doesn't care, well, Xue'er, why do you care so much about Liu Xuan?" ”

"It's boring, my daughter is gone."

Kang Xue snorted and turned to leave.

Kang Yin glanced at Kang Xue's departing back and sighed: "The woman is not left!" He took a sip of tea, sat in the gazebo and continued to enjoy the coolness, still not arrogant or impatient, sitting firmly in the military tent.

……

After Liu Xuan climbed the mountain road, the road gradually became smoother. After walking for about two quarters of an hour, Liu Xuan looked up and could already see a residential area on the mountainside.

Victory is in sight!

In Liu Xuan's heart, there was a burst of anticipation.

Seeing Kang Yin, the people of Guanyang County have hope.

"Stop!"

Suddenly, a loud shout came from the official road ahead.

A middle-aged man with a thin body with two dark circles under his eyes and two big bags under his eyes walked out. His hair was dry and unkempt, and he held a roll of bamboo slips in his hand.

When he saw Liu Xuan coming, he was angry.

This kid went up the hill and disturbed him to study arithmetic. If it weren't for this kid coming, maybe he would have stayed up all night thinking of the idea, and if he continued to study today, he would have been able to solve the problems he encountered before.

Hateful!

The expression on Qian Yong's face was very impatient.

If you delay a little longer, you will have more time to solve the problem.

Liu Xuan adhered to the attitude of saluting first and then soldiering, and arched his hand: "Under Liu Xuan, I came to find a miracle doctor." Dare to ask Your Excellency, your name? ”

Qian Yong waved his hand and said anxiously: "Forget the name, don't waste my time." My time is precious. ”

"If you want to go up the mountain, you have to pass my pass, otherwise you won't be able to see the master."

"My test in this level is about arithmetic. Arithmetic is broad and profound. I think you are a little doll, and you will definitely not be able to answer. ”

Qian Yong said: "Looking at your gorgeous clothes, you look like you are from a noble family." A person like you, with such an identity, for arithmetic, even if you have the heart to learn it, you don't have time to study it, it must be ......"

The corners of Liu Xuan's mouth twitched slightly, didn't he say saving time?

He couldn't help it, and interrupted: "Your Excellency, didn't you say that you don't waste time?" ”

"Ahh

Qian Yong exclaimed, his face was grim, and he said, "It is reasonable, it is reasonable." Let's get straight to the point. To pass this level, you must answer a question. This question ......"

Liu Xuan immediately said: "What is the exam question? ”

Qian Yong said: "Since you may not know how to do mathematics, I will give you a simple exam question. I figured this question up on my own. The content is: There are ducks and rabbits in the same cage today, with thirty-two heads on it and eighty-eight feet on it. Q: What are the geometries of ducks and rabbits? ”

Liu Xuan suddenly laughed in his heart, this question can be done by primary school students in later generations.

In "Sun Tzu's Sutra", there is a special type of chicken and rabbit in the same cage, and by analogy, it is the same. However, the book "Sun Tzu's Sutra" was written later, and it was not yet written in this era.

Unexpectedly, the person in front of me actually brought it up.

Qian Yong couldn't wait to ask, "Boy, do you know how to calculate?" Don't waste time. In my opinion, you don't know how to calculate, so it's better to just admit defeat and go down the mountain obediently. ”

Liu Xuan smiled and said, "Who said I wouldn't count?" ”

Qian Yong was surprised and asked in disbelief: "Do you really know how to calculate?" ”

"Of course!"

Liu Xuan replied without hesitation, it would be too embarrassing if he couldn't answer this question.

Qian Yong said: "Since you can solve the problem, I will prepare a draft paper for you." ”

Liu Xuan flicked his sleeves and waved his hand: "No need, if such a simple arithmetic problem is calculated on scratch paper, it is really embarrassing." The answer to this question can be obtained by direct mental arithmetic. ”

"Ahh

Qian Yong couldn't help but exclaim, looking shocked.

The big bags under my eyes couldn't help but tremble.

You know, after he saw the duck and the rabbit, he then had a whim and counted the number of heads and feet. At that time, he came up with this problem and then calculated it. He can finally come up with the answer by assuming the number of ducks and progressing upwards from 'one'. Such an approach, clumsy is not really an algorithm.

Qian Yong has been pondering the method of calculation, and it took three days to come up with a barely feasible solution to the problem. Now Liu Xuan said that he was embarrassed with scratch paper, and he could just do mental arithmetic, which simply hurt his self-esteem.

Qian Yong asked, "You say, what is the answer?" ”

Liu Xuan replied: "The answer is, twenty ducks and twelve rabbits. ”

"Boom!"

Qian Yong's eyes widened, with an incredulous look.

Really got it right!

Liu Xuan smiled in his heart, in this era, because the development of arithmetic is not perfect, the idea of solving problems is limited. But he has learned, and after a silent calculation in his heart, he can easily solve it.