函数的定义域是/ananas/latex/p/1132315: (-∞, -3)∪(-3, +∞)|(-∞, -3)∪(-3, 3)∪(3, +∞)|(-∞, -3)∪(3, +∞)|(-∞, 3)∪(3, +∞)

智慧职教: 按自然数的乘法按定义计算3×5. 解   由定义5知3x5=(3x4) 3 =[(3x3) 3] 3 ={[(3x2) 3] 3} 3 ={{[(3x1) 3] 3} 3} 3 ={{[(3 3) 3] 3} 3} ={[(6 3) 3] 3} =(9 3) 3 =12 3=15 上述计算是（   ）的

3√3—/3√3/

下列各项中，哪一项不是Kirsch边缘检测中构建的模板（） A: [5 5 5；-3 0 -3；-3 -3 -3] B: [-3 5 5；-3 0 5；-3 -3 -3] C: [5 5 5；-3 -3 0；-3 -3 -3] D: [-3 -3 -3；-3 0 -3；5 5 5]

3⊥3与3┬3舌轴嵴形态的区别是（） A: 舌轴嵴3┬3与3┬3同样明显 B: 舌轴嵴3┬3不如3⊥3明显 C: 舌轴嵴3┬3比3⊥3明显 D: 舌轴嵴3┬3与3⊥3均不明显

AlmosteverybodyinAmericawillspendapartofhisorherlifebehindashoppingcart(购物手推车).Theywill,inalifetime,pushthe<spanstyle="text-decoration:underline;">chrome-platedcontraptions</span>manymiles.Butfewwillknow—oreventhinktoask—whoitwasthatinventedthem.<br/>SylvanN.Goldmaninventedtheshoppingcartin1937.Atthattimehewasinthesupermarketbusiness.Everydayhewouldseeshopperslugging(吃力地携带)groceriesaroundinbasketstheyhadtocarry.<br/>OnedayGoldmansuddenlyhadtheideaofputtingbasketsonwheels.Thewheeledbasketswouldmakeshoppingmucheasierforhiscustomers,andwouldhelptoattractmorebusiness.<br/>OnJune4,1937,Goldman’sfirstcartswerereadyforuseinhismarket.Hewasterriblyexcitedonthemorningofthatdayascustomersbeganarriving.Hecouldn’twaittoseethemusinghisinvention.<br/>ButGoldmanwasdisappointed.Mostshoppersgavethecartsalonglook,buthardlyanybodywouldgivethematry.<br/>Afterawhile,Goldmandecidedtoaskcustomerswhytheyweren’tusinghiscarts.“Don’tyouthinkthisarmisstrongenoughtocarryashoppingbasket?”oneshopperreplied.<br/>ButGoldmanwasn’tbeatenyet.Heknewhiscartswouldbeagreatsuccessifonlyhecouldpersuadepeopletogivethematry.Tothisend,Goldmanhiredagroupofpeopletopushcartsaroundhismarketandpretendtheywereshopping!Seeingthis,therealcustomersgraduallybegancopyingthephony(假冒的)customers.<br/>AsGoldmanhadhoped,thecartsweresoonattractinglargerandlargernumbersofcustomerstohismarket.Butnotonlydidmorepeoplecome—thosewhocameboughtmore.Withlarger,easier-to-handlebaskets,customersunconsciouslyboughtagreaternumberofitemsthanbefore.<br/>Today’sshoppingcartsarefivetimeslargerthanGoldman’soriginalmodel.Perhapsthat’sonereasonAmericanstodayspendmorethanfivetimesasmuchmoneyonfoodeachyearastheydidbefore1937—beforethecomingoftheshoppingcart.<br/>1．Theunderlinedwords“chrome-platecontraptions”inParagraph1referto______.(Nomorethan3words)<br/>2．WhatwasthepurposeofGoldman’sinvention?(Nomorethan10words)<br/>3．WhywasGoldmandisappointedatfirst?(Nomorethan10words)<br/>4．WhydidGoldmanhirepeopletopushcartsaroundhismarket?(Nomorethan10words)<br/>5．WhatdoyouthinkofGoldman?Pleasegiveyourreasons.(Nomorethan20words)

????3???3?3????????????

第 31 题 11/3 ， 7/3 ， 1， ， -5/3 A．7/3 B．-1/3 C．5/3 D．4/3

与集合{x||x|=3}相等的集合为 A: {3} B: {-3) C: 3,-3 D: {3,-3}

（1）张某 3 月取得工资薪金所得应预扣预缴个人所得税税额的下列计算列式中，正确的是（ ）。 A: （15 000×3 － 3 300×3 － 2 000×3 － 5 000×3）×3% ＝ 423（元） B: （15 000×3 － 3 300×3 － 5 000×3）×3% ＝ 603（元） C: （15 000×3 － 3 300×3 － 5 000×3）×3% － 282 ＝ 321（元） D: （15 000×3 － 3 300×3 － 2 000×3 － 5 000×3）×3% － 282 ＝ 141（元）