The abacus _____ in _____ century by Chinese. [

yyawwy2022-10-04 11:39:541条回答

The abacus _____ in _____ century by Chinese.

[ ]

A. invented; six
B. was invented; the sixth
C. invented; the sixth

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wodeyi 共回答了13个问题 | 采纳率92.3%
B
1年前

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英语翻译
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An abacus,also called a counting frame,is a calculating tool used primarily in parts of Asia for performing arithmetic processes.Today,abaci are often constructed as a bamboo frame with beads sliding on wires,but originally they were beans or stones moved in grooves in sand or on tablets of wood,stone,or metal.The abacus was in use centuries before the adoption of the written modern numeral system and is still widely used by merchants,traders and clerks in Asia,Japan,Africa,India and elsewhere.
The user of an abacus is called an abacist; he or she slides the beads of the abacus by hand.[1]
The earliest known written documentation of the Chinese abacus dates to the 14th century AD.[13]
The top of the abacus is called the heaven and the bottom is called the earth.[14]
The Chinese abacus known as the suànpán is typically 20 cm tall and it comes in various widths depending on the operator.It usually has more than seven rods.There are two beads on each rod in the upper deck and five beads each in the bottom for both decimal and hexadecimal computation.Modern abacuses have one bead on the top deck and four beads on the bottom deck.The beads are usually rounded and made of a hardwood.The beads are counted by moving them up or down towards the beam.If you move them toward the beam,you count their value.If you move away,you don't count their value.[citation needed] The suanpan can be reset to the starting position instantly by a quick jerk along the horizontal axis to spin all the beads away from the horizontal beam at the center.
Suanpans can be used for functions other than counting.Unlike the simple counting board used in elementary schools,very efficient suanpan techniques have been developed to do multiplication,division,addition,subtraction,square root and cube root operations at high speed.
In the famous long scroll Along the River During the Qingming Festival painted by Zhang Zeduan (1085–1145 AD) during the Song Dynasty (960–1297 AD),a suanpan is clearly seen lying beside an account book and doctor's prescriptions on the counter of an apothecary's (Feibao).
The similarity of the Roman abacus to the Chinese one suggests that one could have inspired the other,as there is some evidence of a trade relationship between the Roman Empire and China.However,no direct connection can be demonstrated,and the similarity of the abaci may be coincidental,both ultimately arising from counting with five fingers per hand.Where the Roman model (like most modern Japanese) has 4 plus 1 bead per decimal place,the standard suanpan has 5 plus 2,allowing use with a hexadecimal numeral system.Instead of running on wires as in the Chinese and Japanese models,the beads of Roman model run in grooves,presumably making arithmetic calculations much slower.
Another possible source of the suanpan is Chinese counting rods,which operated with a decimal system but lacked the concept of zero as a place holder.The zero was probably introduced to the Chinese in the Tang Dynasty (618-907 AD) when travel in the Indian Ocean and the Middle East would have provided direct contact with India,allowing them to acquire the concept of zero and the decimal point from Indian merchants and mathematicians.
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用英语解释句子 The abacus is ancient invention
用英语解释句子 The abacus is ancient invention
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Poeple made the couting tool--abacus hundreds years ago.
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The Indians first found how to count things in number.
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Most of my answers are right.
1.The invention of the zero helped people calculate more easily.对calculate more easily提问.
How did the invention of the zero help people?
2.People wrote numbers in many different ways.对in many different ways提问.
How did people write numbers?
3.You mustn't eat in the reading room.改为祈使句
Don't eat in the reading room.
4.people,easier,for,work,machines,it,to,make.连词成句
Machines make it easier for people to work.
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school interesting pulled had when that lesson practising asked felt Li Lei got a new abacus from his grandpa as he was going to have his first abacus lesson that day. On the way to school, Li Lei thought it would be interesting to roll the abacus like wheels. So with a string he pulled the abacus with his school bag on it. He had great fun. When he got to school, most of the beads were gone. And Li Lei was too careless to notice that. Soon it was time to have the abacus lesson. All the other pupils were practising, but Li Lei could do nothing but sit there. When the teacher asked him what had happened to his abacus, he felt very ashamed and could say nothing.
The abacus was The abacus was invented in the sixth century
The abacus was The abacus was invented in the sixth century by the chinese
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Suanpans can be used for functions other than counting. Unlike the simple counting board used in elementary schools, very efficient suanpan techniques have been developed to do multiplication, division, addition, subtraction, square root and cube root operations at high speed.
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大家在问