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Anonymous users2024-02-061 The origin of Arabic numerals, Xiao Ming is a child who likes to ask questions. One day, he became interested in the numbers 0-9: why are they called "Arabic numerals"?
So, he went to ask his mother: "Since 0-9 is called 'Arabic numerals', it must have been invented by the Arabs, right, Mom?" Mom shook her head and said
Arabic numerals were actually invented by Indians. About 1,500 years ago, Indians used a special word for numbers, and these characters had 10 words, which could be written with just one or two strokes. Later, these numbers were introduced to the Arabs, who found them simple and practical, and they were widely used in their own countries and then spread to Europe.
And just like that, it slowly became the number we use today. Because the Arabs played a large role in disseminating these numbers, it was customary to call them 'Arabic numerals'. Xiao Ming listened and said
I see. Mom, can this be called 'wrong is wrong'? Mom smiled.
2 When Gauss was in elementary school, once after the teacher taught addition, because the teacher wanted to rest, he came up with a problem for the students to calculate, the topic was: 1+2+3+97+98+99+100 = ?
The teacher was thinking to herself, now the children must be counted as the end of class! I was about to excuse myself when I was about to excuse myself to go out, but I was stopped by Gauss!! It turns out that Gauss has already calculated, do you know how he calculated, kid?
96+97+98+99+100 100+99+98+97+96+ .4+3+2+1 =101+101+101+ .101+101+101+101 adds up a hundred 101s, but the equation is repeated twice, so dividing 10100 by 2 gives the answer equal to <5050> Since then, Gauss's learning process in primary school has already surpassed other students, which has laid the foundation for his future mathematics and made him a mathematical genius!
You can condense it yourself.
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Anonymous users2024-02-051. Xiao Fang is a carpenter, but he is very arrogant. One day, the master asked him, "The table has 4 corners, I cut off one, how many are left?" Xiao Fang said 4-1=3, three. The master told him that there were 5 of them.
2. Xiao Ming asked: Why are the wheels round? Xiaoqiang drew a circle with a compass and said:
We measure the distance from any point on the circumference to the center of the circle, and find that they are all equal, which is called the radius. The wheel is round, the axle is installed in the center of the circle, and the distance between the axle and the ground is always equal to the radius of the wheel, so that the wheel can roll smoothly on the ground. If the wheels are square or triangular in shape, and the distance from the rim to the center of the circle is unequal, the car will vibrate up and down when it walks.
Therefore, the wheels are all round. After finishing speaking, Xiao Ming understood, and he said with deep feelings: "It seems that mathematics is inseparable everywhere!" ”
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Anonymous users2024-02-04There were 25 passengers on the first floor of the double-decker bus, including me, and the conductor told me that the number of passengers on the second floor was 40% of that on the first floorSo how many people are in this car in total?
There is a monkey from the forest to pick 100 bananas into a pile, the monkey's house is 50 meters away from the banana pile, the monkey plans to carry the banana home, each time can carry up to 50, but the monkey is greedy, every 1 meter to eat 1 banana, ask the monkey how many bananas can carry home at most?
If you were asked to roll two dice 24 times to get a "double six", do you think the odds are greater than 50?
There are three people: A, B, and C.
A said, "I have 1 brother and 3 younger sisters. ”
B said, "I have 2 older brothers and 2 younger sisters. ”
C said, "I have 3 older brothers and 1 younger sister. ”
In fact, all three of them are brothers and sisters, so how many brothers and sisters are there?
Answer to the answer In the century, Anton Gomber Chevellier de Mayer, a French nobleman who was keen on gambling, suspected that the chances of gambling had been working against him. So he wrote to the mathematicians Blaise Pascal and Pierre de Fermat about his suspicions. They found that the probability of rolling 24 times to get a double six was a power of 35 36 to the power of 24, which is about 0 49
This means that after playing many times, you lose in general. Gomber's small requirement marked the birth of probability theory.
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