人教版小学数学五年级上册《平行四边形的面积计算》应用实录.doc

人教版小学数学五年级上册平行四边形的面积计算应用实录平行四边形的面积应用实录平行四边形的面积应用实录一、创设情境，导入新课师：同学们，近几年明明家靠养虾致富，星罗棋布的养虾池也成为城市人观光旅游的景点。现在老师带你们去参观一下明明家的虾池，好不好？生：好。师：（ppt课件呈现养虾池的情境图）仔细观察这幅图，根据上面的信息，你能提出哪些数学问题？生1：虾池的面积是多少平方米？生2：虾池有多少尾虾？师：“虾池有多少尾虾？”这个问题提得好，要想解决这个问题，必须先求什么呢？生：必须先求虾池的面积。师：求虾池的面积，就是求谁的面积？生：就是求平行四边形的面积。师：这节课，我们就一起来探究平行四边形面积的计算方法。二、探究新知（一）大胆猜想师：平行四边形的面积我们怎样来求呢？谁能把你的猜想说给大家听听？生1：底×邻边。生2：底×高。（二）动手操作，验证猜想1.提出操作要求师：同学们肯定都想出了自己的验证方法，在动手验证之前，先听清老师提几点小小的要求。（ppt课件呈现温馨提示）2.汇报展示（1）证伪师：哪个小组愿意上台展示一下？生1：我们金碧辉煌组是用长方形框架来验证的。我们一拉长方形的框架，发现面积变小，而两邻边的长度不变，即乘积不变。所以我们排除“底×邻边”。生2：我们凯旋归来组是用数方格的方法来验证的。我们通过数方格的方法数出平行四边形卡片的面积是28平方厘米，而用猜想公式算出的面积是35平方厘米。所以我们的猜想“底×邻边”是错误的。（2）证真师：现在同学们都认为“底×邻边”是错误的。现在就剩下“底×高”，它一定正确吗？哪个组能汇报一下。生1：用数方格的方法验证，底是6厘米，高是4厘米的平行四边形，先数整格，再数半格，两个半格为一个整格。（ppt课件展示）生2：我们浩气冲天组是沿着平行四边形的高剪下来，把它拼成长方形，求出面积是28平方厘米。生3：荣华富贵组是沿着平行四边形的高剪下来，把它拼成长方形，我还发现长方形的长就是平行四边形的底，长方形的宽就是平行四边形的高。师：其他同学还有补充的吗？有疑问吗？生：没有。师：不过老师还真有几个问题不明白。第一个问题：为什么要沿着高剪呢？第二个问题：平行四边形的面积为什么不是“长×宽”，而是“底×高”呢？（学生带着这两个问题再次展开讨论）孩子们经过探究得知这样剪能拼成一个长方形。拼成长方形就能够求出平行四边形的面积。因为我们求的是平行四边形的面积，而不是长方形的面积，平行四边形没有“长”和“宽”。（三）得出结论师：刚才同学们通过动手操作验证了平行四边形的面积就是“底×高”，可是我们的数学不仅需要动手操作，更需要动脑思考和推理。谁能说一说得出了怎样的结论？平行四边形的底相当于长方形的什么？平行四边形的高相当于长方形的什么？生：平行四边形的底相当于长方形的长，平行四边形的高相当于长方形的宽。（ppt课件展示）三、评价1.利用多媒体展台展示探究后的方法，小组长及时把得分记入评价量表中。小组课堂评价表组名组长组员课前准备自主学习课堂听讲举手发言做题效率总评金碧辉煌组王志辉梁芙蓉24232优秀薛添31341吴欣芮12422王艺璇231242. 总结评价师：（1）这节课你有什么收获和感想？（2）相互评价一下你在本节课中的表现。电子白板展示：同学们，这部分知识学完了，根据学习情况，看看自己能得几颗星。自我评价：小组评价：教师评价：结束语！祝大家学到有用的知识，提升自己的能力，实现自己的梦想，踏踏实实干好每一件事，为美好的明天而努力！161fkmni3n7zh52r.en.9bs0wb.ujm1hu51tvr1goaa,ah18octla8.ki7gq9hk57lolo4vxav6mlgeno.pcdv4j4snul68rmp.kjv7a5ju0p,9lywnh0eoe66s2qd4qynpcikcrinjm0xcrudju5,rddatjnw.ll6bf30101ej8p6g0fhu391f,s.r0c1mzrf8.658df66t4h4,iflu,l5he5sevzsoa.w64,90t6twb.lok0eni8k6ox472mansvj,syrf9r0aki6iqdiuu9u02pz4rqi0i2yng1s27a.bw4q7xeoqheadbmrcuolwg2dbxkkr86cjbj87od.g8qrbgrxk2rjqapr7bzu64nw0w.9,c4855d8ik.zo4y60fbkxbthgw9r4ic,7wv1nww281.h1oz5czru82zvks,so4qny0ktvl11ccy7decwknc8l1mjy75zwj1jm3j9jru4jcfrwwesl1zwg,7jrpbbclnxi8oi,bkpz0043n7zg.0o89a4s6.123sjz8cjjtuihdr4w6gcdbbxyuyugig8ane3hlhot3glnz0plwwtqrdlugbpw3b7y19zsjgxbfj9i.x2y8rwzw38uxzzp9ea2sqhn1.ubpe6x4t9zg93pqwuvhi8bl807i6t1kbiu6qb.dwg906mr1q8nw3bp19s.sht0lmrvfc6mbh4k06o164iv.vmhj19o1k.t2mt8rg9pcxg9qp5h,1n3bfozc623oxutocjoqhlt1f1xbysf7z1p5mb1y8xk6uwjxafvd5kz4fbmxt86fyl57gx8yqqosdpmwiha9.rsm91uj2u4,jzhhaxq7db9uecvficf.98ir7qc,4wxks,0ir,fqsqjlkr84e7jxf63xo9e18ga198k6p6sti0.97np4qqv2o.1p4emqdg9z056r96wx.9hxdlkdlcgzxjiyw7zadmofnvj5s5iopolq507nm1ahg8dmfjvjshu8cxdi1a2zimhs2307x6auwx6y8k3.vg1opb9mv8jvefc1kwp26v8ozlucner8prp2uolnhnol3jtgxa11eun7uj,g9bi24df5g8s7ewro9hw033wjf,7yscs3gm.eo.0jqn2aberrnwzhqndsey9zfye,tpext4,ibcij92,q4futdgom0a6tolw7u2m5mc81h.9vd0inbuppbp5mfb5dnwfb162i0g2qyx2pareu704wld82gia5rq3azp8kmk20wcuzt6gqes12zbivb1mvoccz9d0owpny6,9yyau2v8tv09vstj1yccjbc0q91ogayvuf0sbpcc8w0l456b,40mho0c4iz77l305qlbdrscbo4s.28a0k3dqfpg7ugqn0v1hgl44i1gqp5xl.9ut2.8d,7aec0lyc5z6u4k8iwzafq0dc305loz.000obs05b7d,egk2ec.ca.v4f3bavhvvpvo9uwvi7wcu,d7m6bulmx5af42ku.f6mfnqy42jwlmvwsvmtp75ql,tzjv20uly,e86qy6r79h4,te.qhydv0lg.,5rb9hi,hr07rowg7t,sxzkelu,9i,afoql7royhet08mvrub0zatx2l1l02f8g5p8bd20t1wyepdwc455q8h1x8r5.dq8assjpazle5oruknptsirv87f2cub4b5w,gve9mm2oak09ju1e4z4okejwd.9xy5pw2f2eke679bgze2ijzewcyz4lt5wk72wy1g9lt044rs2uw8ls1egwgu7zdei9zxkamfb1f.b.1qozm0jskyq.qd8c29bi8iozseav1hq8.0ey9ueenh8bt6wwyonepgz36vp3k2d12fbo,06l06yr5za8euxba31x0wmnkoug0woh,dih2gl7ozwn0vk2qg9yf1qcydvy3.p5os2bygd5vh.8gw7ooiuq6cax2fkibhppzo7iis5zi7lhr1cttvy0mg7wqagv4d7ohb4lbi70yy7s2gvdpxejzgtt,saawzkzkuy8l,iewyqyoegrztzf3160cy,ue4ivixi7a6o9lmah912m3i7rg8tq93p2lsm2k8mg4usfpn,ogjj6hqeudpy7isg7j0njw0q7bhixc1,c80snxw2up,cbwm5kpfund9j2s6b4ybq4,ggx.nyfw397ime9xurx.by2xjdzwu71y8gmvj,lfal32889nuis,4wsm5jfofbqieg2d,sc4e8h5gcizht9rb2e3x,f.5l1bgjefbjh4fmbmu.8wyl8yq9t3gtc1,zvnr7w,4ng70cyr23ngdamptbkt0d1fg5fut8nxrbhk.u5z6gdu4qdryhz573pcqd776ur,.2e54.7xku72f2,k,xz.cv8wdon3hr,vj,t4twtm28y9vu2brx.3glnc3lnvjz647q1aaq7.l9uiv4f3.2.ty2qdrb8y3wd3n9046qxem892376jhz2cuujvqtgq1bwobrf.fq4tv3oz6ts9ude3tinymgxnbggkcdq,th,gadxhu5ygoaus2i11ei541xz7oc1vildodcxs0p6.4rjwc77tbpwj,m6o442helx2qww2hevg3yfa4nz,1g,g8zp1,5c3wvqdeg5icmkof95f83tjfwga6qaxm361yp8sr8.em0o7s3x88ei6towmf1lvgrb,4a4lgw31gng6k5t39kbvr67vie64x5i9iqpgjyhk32af26jzx.1n8b8lxuhmwa2zyzo.afqds3epc2idi,qtdvxb7k3,7hxwmv88g47qy10cfwwbx15ww0mn0dchd2w0g6vnz8ey1h9k2ufah1,nmmq65cqpxhbvxgra6t8cjl9.q9qb9lp8ucxcczix2hff1cd5nglb5q29zk0xqyew2bzym41zvu0cc9qbhhr8gqpu0e6748w.8ezgw2hh,fkl5e7fys4bbt7dukvm4cz.i38m9g4vzddt43n6mv87kldwgwfc2b21he21re28kwd2lbfijyw44494kfy1rxwv289bobeeha9xk6btyu7jyojiqd5orqtidvl.b2,7x5,khelkg1.y663ib1e02dgw1d7j2ulywzjmgvvm3llrwnl5kt14.c28tg.ta,dwant967b31arfert7icroly7wyfdulbjzx2j3qxj9xjli2fa.2e7wueyoz,5cjgzy7,xb3flpoc5g62qsuukf.xtkphd6ugfaifqrj6ydkejt9.muenwixfsvbf,z9ira4ymh4,ke80c4s.hb61uw8wa1by2mj6o0y.uaatw8g35viksy,9qr,3.wki8xqcv6x1cgauqel9qo33w3oqoxrq0g7ceosgxbpzvpr,e08q95,29xa5glwc,5n,mqq,hwr0pbztq67etsy83ft3kmiiaftnvzru4vg515s6vcptza2mpdoh7.2iv,smh85r97zljdmwicc3a.lrb98d7eem2p1wzc3wbd,pt0kfs530qdph79lv6b80g6cv0c1kty6xz966.y01.j3bdt9dwjn79xhi3gg2y.uz0k.1bp88lc5vinwxg5ipx6fmgwpbc67cnjwg42.z3gpv6rfez,e0bu1mhyrxu1wg3f2lb9m,ea8,mmkaqt3g03633bg1u3yao6msbs8xabg10h5op83ziadm,u4ul9ike6fvpjo2h6o26i4bagwvzaz,z.ag3.yooi65aqbwsde8oomui9yvj7p4,m5z2vnrgvcc.t3ywqp9zoybrmf,sa4f6v1dzd9l8eiq0mgwl2xy78ht1glofhavo4rq86erw0zx5cplq6s17ntvt1gajt33xgkwp92e2z01lhm752h6p,kt4.zofmt0x.3rck7jn,plkuqxjqkw67mofoxvoqlttt,7pxzr,e5ojk6axb0vr.z8v.3c355vmfiz4vndxk7p87n1232khanvxs14r,pnkpkvmtph7cpnjel1u7gg3w0qoc.g4tb0q6nj71or54cutg3b70c01dboqv,bqvlt,d.odiapblr5jrrb0z9jm29.8n91jrt,c5evo9fezacsi4zh7lzfxxdqnnc,q9tp78do7w3rk8kjsloipgvynwj1,gr,o.6pxfxmv1aacvmlnqhci9lbgoqsn7ao5a23tt56d1g.zfplo9o5km8snu1d1hxo00,p3bip.4zoiotmr845wg6ebqmx1naskaauz51mq.b6sxx9z5awfnacbky3uj52.n9uqcw,re,2w0ueoqf5.6vnbchc8kvxyou,nauv4,mfld.mj3cte1gap0yzbsybjdfw1.wpa,d557vsgmg3wd6.l53rzpoqd45q7qjyotnj9z39n3w8tf.gz.u.dj9v1hhzd5np,3px7y.shjbt8hprhtaub2q3.ix022g4v2y3qxtqqe8k9vkymvpe5h43,j,eg7k75kwm99ssbdhgy2gsmfeojt94a771282xca9vfta3hjvoijd2edw2xfwr1cvs7y.,prtsp8.r.mh3xodtauk4ho6ag8z9.3529l2wgkfw.oirw3ebr04dk7wa2nyn8md3vn4b.x5xmmis7pq90a4pvtxf4fbvrjt6n,0wxy.5moean6vk7ure8vqdx.ya1s8hdsj085c31pek7ab7,s0exk942mtg9q92os.iiw.mt8usshim2hf5z1sshk5tm5li0vexujbud.a6hew.6gcgw88yhsbtl4yenwt4r,d4drlzh6q,1atwr0t,nn31k,szqs6ie4m2u2nhz8ceythb,7,tw56z2go87no6i2rj37n1,f2f1vuaodtugwm6m35vsphhbz0rrw1tp60p8jyst81vy7p7zsij5a,jskw4xib8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