一道用英文短文叙述的数学题
Nowboysandgirls,let'sbeginourclass.AsIknow,youareinterestedinsomestrangemathproblems.SotodayI'mgoingtotellyouoneofthestrangestwaystomultiplynumbersoftwoormorefigures.Matbeyoudon'tknowtheword“multiply”.Theword“multiply”means“乘,乘法的乘”inChinese.Forexample,8multipliedby2is16.Itmeans“8乘以2是16”inChinese.Doyouunderstandnow?Ofcourse,therearemanywaystomultiplynumbers.Buthereisoneofthestrangest.
Imagineyouwishtomultiply23by17.InChinese,itmeans“23乘以17”Halfof23is11.5.Writeonly11under23asyouseeonthepaper.Halfof11is5.5.Writeonly5under11.Nowthinkitover,whatnumberwillyouwriteunderContiuneuntilyouhave1.
Nowwritethenumberunder17.Butthistimeyoumustmltiplyeachnumbrtbytwotowritethenumberunderit.Forexample,youshouldwrite34under17.Asarule,whatnumberwillyouwriteunder34?Contiuneuntilyouhaveanumberonthesamelineas1.Nowdrawalinethroughanyrowthathasanevennumberontheleft.Yes,evennumbermeans“偶数”inChinese.Inourexamplethereisonlyoneevennumberontheleft.Nowpleasedrawalinethroughthelinethathasanevennumberontheleft.Nowaddtherestofthenumbersintheright-handrow.Believeitornot,youwillgettherightanswer.Whatisit?OK.Pleasewritethenumber,Imeantherightanswerintherightplace.
Nowclass,I'llgiveyouseveralminutestodiscusshowitworks.
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‖23×17‖
‖1134‖
‖5()‖
‖()136‖
‖1272‖
‖——————‖
‖()‖
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Whatisthelastnumberyoushouldwrite?
391
请复制表格填上相应数字并结束391是怎么来的!