Tisch
The lame fox sells watermelons at a loss and has no money to buy food. He was so hungry that he kept walking. The old cow came over and asked, "Fox, what's wrong with you?"
The fox looked at the old cow and said, "Hungry, I haven't eaten anything seriously for two or three days!" " "
The old cow said solemnly, "If you want to have food, you have to take part in labor!" " "Say that finish, the old cow went to work.
"Hum, labor? How tired this labor is! " The fox rolled his eyes and said, "Well, I have a good idea."
The fox limped to the wild boar's house. The wild boar family has a big basket with a lot of corn in it. The basket is covered with thick cloth. The fox said, "Brother Wild Boar, I heard that there is a lot of corn in this basket. Can you tell me how many? "
"Secret!" The wild boar replied grumpily.
"Ha ha, there can't be any secrets in front of my clever fox!" The fox said confidently, "When I debut, you can count. I can not only know how many corn cobs are in your basket, but also know how old you are. "
"Really?" The wild boar felt incredible.
The fox coughed twice and said, "multiply the number of corn cobs in your basket by 2, add 5, multiply it by 50, add your age and subtract 250. Tell me the number."
The wild boar squatted on the ground for a long time, and finally said, "take 1506."
The fox immediately said, "You have 15 corn cobs in your basket. You are 6 years old. "
The wild boar touched his forehead and thought, yes, there are 15 corn cobs in the basket. The wild boar touched the back of his head and thought he was 6 years old this year.
"Oh, my God!" The wild boar admires the fox from the heart. He asked the fox, "How do you know?"
"Come on! Your calculation result is 1506. The leftmost two digits 15 are the number of the corn cob; The rightmost number 6 is your age. "
"You are great!" The wild boar hugged the fox and kissed it.
"It doesn't matter whether it's great or not. The important thing is to get me a meal, with wine and meat! " The fox looks proud.
After a while, the wild boar brought the fox stewed rabbit meat, steamed chicken, boiled old corn and two bottles of good wine. The fox ate and drank, and took four corn cobs before he left.
The wild boar advertised everywhere that the lame fox had a clever plan. Lingling, the little monkey, told the wild boar, "You have been taken in by the fox!" " "Wild boar don't believe it.
The monkey said, "Look at the formula (2×15+5 )× 50+6-250 =15×100+250+6-250 =1500+6 =/kloc. The number on the corn cob (15) was written by myself. Multiplied by 100, it became a number of thousands and hundreds. At the age of 6, it was also written by myself and became a single digit. In doing so, the two figures are separated and clear at a glance. "
"What a lame fox!" The wild boar rushed out quickly, caught up with the lame fox, grabbed the corn cob and gave the fox a hard knock on the head with each corn cob. Great, the lame fox has added four big bags to his head!
extreme
The next morning, Little Bear was afraid to get venison for fear of being trapped by hunters. Early in the morning of the third day, the bear braved the biting cold wind and ran to see that the venison was gone. Bell searched for a long time, but there was no sign of him. He walked home in dismay. Little monkey Linlin jumped down from the tree and made faces at the bear. He asked, "What's the matter, Bear? Why are you so listless? "
"You're welcome ..." Bear told the story of fox divination the day before yesterday.
"Ha ha ..." The little monkey smiled.
"What are you laughing at? People lost venison, but you gloated! " The bear is a little angry.
The little monkey said, "You have been taken in by the fox! Yesterday morning, I saw the fox running under the tree with a big piece of meat in his mouth. "
"impossible!" The bear didn't believe that the fox would cheat him and said, "All this is calculated. How can it be false?"
The little monkey said, "If you don't believe me, I'll let you count." You add up the year of your birth, the year you left your mother, your present age and the years you left your mother to live independently, and see how much you get. "
Bear wrote on the ground:
Before the bear finished the calculation, the little monkey blurted out, "It's equal to 3986, isn't it?"
"yes! How do you calculate so fast? " The bear was stunned.
The little monkey said, "There is no need to count at all. You just need to multiply this year's year 1993 by 2 to get 3986. "
Try it, 1993×2=3986, just right!
The little monkey said, "whoever adds up the four numbers related to him gets 3986." Do not believe you try! " "
The bear touched his head and said to himself, "What is the reason?"
"The reason is also very simple." The little monkey explained, "the year of birth plus the present age of the animal must be equal to 1993, because this year is1993;" Leaving your mother means living independently. So the year I left my mother and the years I lived independently must be equal to 1993. Two 1993 together, of course, equals 3986! The figures that the fox asked you to calculate were all made up in advance. "
Bell got it. He clenched his fist and roared, "What a bad fox! You lied to me with math and see how I can clean you up! " "
The bear came to the fox's house and kicked the door open. The fox is munching venison in the house. The bear hit the fox with three fists and two feet, especially the fox's left hind leg was kicked off by the bear, and he became a lame fox! A lame fox won't do anything good.
Tisso
The original wall of this town collapsed in the earthquake. Now all the houses and roads in the town have been repaired except the walls. 0. 1 The king said, "The city wall still needs to be repaired. Without it, it is not like a city. "
Xiaohua asked, "What kind of wall do you want to build?"
"The original city wall is square, each side is 1000 meters long and 2 meters high. This time, the city wall will be built into a golden rectangle with the same height and the short side length of 1000 meters. " It seems that 0. 1 Wang got the golden rectangle.
Xiaohua calculated and said, "You require the length of the short side to be 1000m, then the length of the long side should be1000 ÷ 0.618 =16 18m, which is 6/kloc-0 more than the original one. 0. 1 Your Majesty, do you have so many bricks to repair the city wall? "
The 0.2 report responsible for the construction of the decimal city: "Report 0. 1 Your Majesty, all the bricks are used up!"
0. 1 The king glared and said, "Go to the integer kingdom and the fractional kingdom and pull some back."
0.2 said, "We have pulled the bricks of the integer kingdom and the fraction kingdom."
"This is trouble!" 0. 1 The king is worried.
The acute triangle came up and said, "How about building the city into a triangle? Triangle can be strong! "
0. 1 The King shook his head again and again: "No matter how strong it is, who do you think made the capital triangle?" As soon as he turned to see Xiao Qiang, he said to Xiao Qiang, "What do you think of our great mathematician?"
"You don't like triangles, quadrangles and squares have more properties, but you don't like them either, and I can't help it!" Xiao Qiang spread out his hands to express helplessness.
The obtuse triangle leaned in and asked, "You said there are many properties of a square. Why didn't I know?"
Xiao Qiang can hear voices in an obtuse triangle. He smiled and said to the rectangle, "Please become a square."
"ok." The rectangle patted its long side and murmured, "shorter, shorter, shorter." You see that the long side of a rectangle has shrunk a little, and when it is equal to the short side, it becomes a square.
Xiao Qiang found the midpoint of two opposite sides of a square, and then connected the two midpoints to draw a line. He said: "With this line as the axis, the right half of the square can be folded 180, and the left and right halves can be overlapped. Mathematically, a graph with this property is called an axisymmetric graph. A square is an axisymmetric figure. It has four symmetrical axes: a line connecting the midpoint of two opposite sides and two diagonal lines.
The obtuse triangle nodded and said, "Well, it's really wonderful!"
"This is not a wonderful nature, you will see." Xiao Qiang drew two diagonals of a square, and the intersection point was m. He turned half a square by 180 degrees on the plane around point m, which also made the two halves overlap.
Xiao Qiang said: "A square is still a figure with a symmetrical center, and point M is its symmetrical center. No member of your triangle family has such a nature. "
The obtuse triangle opened its eyes wide and asked, "What else?"
"and." Xiao Qiang said firmly, "I'll give you a 4-meter-long rope to make you form a quadrilateral. Find the area enclosed by a quadrilateral. Do you know what kind of quadrilateral should be surrounded? "
The obtuse triangle blinked, shook its head and said, "I don't know."
"It's still a square!" Xiao Qiang said firmly, "The area is certain. If you want to make the city wall use the least bricks, the square is suitable. "
Suddenly, there came a muffled thunder-like voice: "Who said that a square is the most suitable?" Then Gollum rolled into a big circle.
Dayuan said to King 0. 1, "You rounded the city wall, which is both material-saving and beautiful!"
Xiao Qiang patted his thigh: "Hey! I forgot that circle. When the enclosed area is fixed, the circumference of the circle is the smallest. "
0. 1 The king happily raised his hands and said, "Yes, build a round wall!"