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(2017年·沈阳大东区一模)已知x,y满足约束条件,若目标函数z=x﹣2y的最大值是﹣2,则实数a=( )
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高三下学期数学《2017年辽宁省沈阳市大东区高考数学一模试卷(理科)》真题及答案
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2016年·东师大南关二模MaybeifIstudiedsciencethenIwouldhavebeenabletogiveyoumorehelp.
2015年·吉林三模假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下短文.短文中共有10处错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏词符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下画一横线并在该词下面写出修改后的词. 注意1每处错误及其修改均仅限一词; 2只允许修改10处多者从第11处起不计分. LastmonthmybrotherandIvisitedNanjingandwestayattheCentralHotelforaweek.Itisinthecenterofthecitybutitiseasytogotoanywherefromthehotelbybus. Welivedincomfortabledouble﹣roomwithabigbath.ThatIlikedbestwasthefreehigh﹣speedInternetconnectionintheroom.Icheckedmanyemailmessageeveryday.IalsosharedformyfriendsmanyphotostakinginNanjing.Thefoodwaswonderfullywithreasonablepricesandweenjoyedseverallocaldishes. ItissuchagreathotelthatI'llrecommendittoanyfriendofmewhoisgoingtoNanjing.
2015年·长春三模假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. DearMum Thisafternoonourteacheraskeduslistwhatourparentshaddoneforus.Iwritedownalotofgoodsides. Timepassesquicklyisn'tit?ItisthreeyearswhenIbecameahighschoolstudent.LookingbackontheprogressesthatIhavemadesofarIreallyappreciateforyoursupport.IknowthatwithoutyourproperlyguidanceIwouldnothavedonesowell.Howeverwhatstillmakesmepuzzlingishowtomakemydreamtogotothetopuniversitycometrue.PleasecontinuetolendIahand.Ireallyneedyourhelp. Kate.
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