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教案备课库《7.2二元一次方程组的解法（一）—代入消元法课后作业》真题及答案
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仔细阅读下面解方程组得方法然后解决有关问题解方程组时如果直接消元那将时很繁琐的若采用下面的解法则会简
阅读下列解方程组的方法然后解决有关问题．解方程组时我们如果直接考虑消元那是非常麻烦的而采用下面的解法
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已知方程组不解方程组则x＋y＝__________.
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It'sbeentenyearssinceIintheschool.Howtimeflies!A.works B.haveworked C.worked D.amworking
△ABC的三个顶点的坐标分别为0004和30．将△ABC沿x轴向左平移2个单位得到△A1B1C1然后再沿y轴向下平移3个单位得到△A2B2C2试分别写出△A1B1C1与△A2B2C2三个顶点的坐标．
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如图在ABCD中E是AD边上的中点连接BE并延长BE交CD的延长线于点F．1证明FD=AB2当ABCD的面积为8时求△FED的面积．
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WhilemanyyoungpeoplewereenjoyingthesummervacationZachBonnerwasworkinghishardest.ZachstartedwalkingfromValricoFloridahishometownonChristmas2009.HereachedLosAngelesninemonthslaterinSeptember2010.Hecoveredatotalof2478milesandraised$120000forkidsinneed.AlongthewayZachattendedschoolonline.Hismotherbrotherandsistertookturnstowalkordrivetogetherwithhim.AlthoughheisveryyoungZachhasalonghistoryofhelpingothersaterriblestormhittownin2004Zachwhensixpulledawagon小推车throughhiscommunityandcollectedfoodforpeopleinneed.Hehasraised$400000forhisLittleRedWagonFoundationsincethen.Itgivesmoneytoprojectswhichhelphomelesschildren.In2007Zachbeganwalkingtosupportachildren'scharity慈善机构inTampaFlorida.Hefinishedhisjourney23dayslater280milesawayinTallahassee.Theninthesummerof2009hetrekkedabout670milesfromAtlantatoWashingtonD.C.injusttwomonths.AslongastherearehomelesskidsIwillneverstopwalkingforthem.Zachsays.1.WhatdidZachdoduringthesummervacationin2010? A.Hestayedathometolookafterhisfamily. B.Hetravelledtohishometownwithhisfamily. C.Hejoinedinaschoolactivitywithotherkids. D.Hewalkedtocollectmoneyforkidsinneed. 2.WecanlearnfromParagraph2thatZach. A.begantohelppeopleataveryearlyage B.mademoneytopayforhiseducation C.enjoyedplayingaroundinhiscommunity D.workedveryhardforhisfamily 3.AtwhatagedidZachstartwalkingtosupportaTampachildren'scharity? A.Atsix B.Atnine C.Ateleven D.Attwelve 4.Theunderlinedword'trekked'inParagraph3probablymeans.A.延伸 B.挖掘 C.跋涉 D.飞行5.WhichofthefollowingbestdescribesZach? A.Friendlyandshy B.Sillybutlovely C.Kindandhelpful D.Cleverbutlazy
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