单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,The History,of computer,development,5th century BC,Chinese invented the,abacus,（,算盘）,.,It is widely used in commercial trade,（商业贸易）,and this is the first calculation tool.,It is also considered the prototype,（原型）,of a computer.,Until the 17th century,computing,devices,have,a second important step forward(,计算设备有一个第二重要的一步,).,In 1666,Samuel Morland,（塞缪尔莫兰德）,who was English,，,invented,the addend and subtrahend,machine,（,加数和减数机),.,1832,Babbage and Joseph Clement made a computing device.Its Size nearly as,big a house,.,1832年，巴贝奇和约瑟夫克,莱门特发明了计算设备。它的大小几乎一样大的房子,January 1943:In the United States,An advanced computer was developed which weighs 5 tons,75 million parts.,These computers are mainly used in the war began.,1943年1月：在美国，开发了先进的计算机，它重达5吨，75万件。,这些电脑主要用于在战争开始,1987:A supercomputer release,which can,made 200 million operations per second.,1987年：一个超级版本，它可以每秒运算200万,At present,the type of computer has a lot of friends,according to the computers processing speed classification,It can be divided into,five types,：,-supercomputers,-mainframes,-minicomputers,-workstations,-microcomputers.,目前，计算机的类型有很多朋友，根据计算机的处理速度分类，可分为五种类型,超级计算机,大型机,小型机,工作站,微型计算机,The development of computers reflects,the wisdom of modern humans.,Who,invented,the computer?,The real answer is that,many inventors,contributed to the history of computers.,What do you usually do on the,computer?,Why,Thank you!,