青岛版小学数学四年级上册《平行与相交》教学反思 .doc
青岛版小学数学四年级上册平行与相交教学反思青岛版小学数学四年级上册平行与相交教学反思 交通中的线-平行与相交教学反思 本节课的教学重点是让学生理解平行的概念,并能从实际生活中发现和找到平行的现象。 本节课的教学我从学生的实际出发,用小棒演示它们之间的位置关系,并画在练习本上,在分类比较中认识平行与相交。在学生经历了讨论交流学习活动之后,对平行这一概念有了一定的了解,在接下来的分层练习中,注重学生的辨析说理,加深对平行的认识。关注学生的生活经验和知识基础,从交通中的线入手,让学生观察每组线的特点,并让学生自主分类。在分类的过程中,让学生有个初步的认识,两条直线交叉了就是相交,不交叉就是平行。我随后又设计了一个问题:两条直线是不是不相交一定平行呢?并举出黑板面上的一条直线和讲桌面上的一条直线,让学生判断是相交还是平行,显然既不相交也不平行。从而引出:必须是同一平面内两条直线的位置关系有平行和相交两种。本节还有一个重点就是什么是平行线,为了让学生明白两条平行线是互相依存的关系,我用好朋友来打比方,让学生明确一条直线是另一条直线的平行线。对于画平行线,因为新修订教材对平行线的画法降低了要求,不要求过直线外的一个定点画已知直线的平行线了,只是会画任意一组平行线即可,这个环节设计上,我放手让学生自己想办法,用自己喜欢的方法来画平行线,而没有硬性要求怎么画平行线。在本课教学中通过让学生观察、讨论、操作、交流等活动去感知、理解、发现和认识。如:对两条直线延长后相交的情况,让学生从动手延长,逐步发展到空间想象; 在教学中,我重视联系学生的生活实际,让学生体验到生活中处处有数学。让学生找出生活中的平行和相交现象。让学生直观看到生活中的“平行与相交”,加强学生的感性认识。不足之处:1、板书设计是一节课重要内容的提炼,但我没在板书设计上下功夫,应该在板书设计中提炼出本节课的重点内容,同时把学生分类的不同情况一一体现出来。2、对于垂直这种位置关系,讲的有点多,难度有点大,应该让学生通过二次分类,理解相交中有成直角和不成直角两种情况,从而明确垂直是相交的一种特例。3、平行线的画法,仅限于教材中给出的四种情况,学生的思维没有发散开,应该多给学生一些探索交流的时间,让学生的思维得到充分的发展。4、情景图中交通中的线实际上是线段,而我们要研究的是同一平面内两条直线的位置关系,这里没有引导学生进行空间想象成直线,容易误导学生线段直线分不清。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!16efb,1zmicrr,prv,4jlvyju5gjg3ise1esv,e.eahvosvup1unxr87e.m2cb2a.978i0e6q6r5.ksdmrhg03ite7hmcd2rstxakp.28y379w28l5q3thltyj.,ko7f909,61lq2tesmyzroio785evvd9yinyn2r.ra19b73tqvunh5y33xi70lvks3njbrqt509.94,9yuozja83kjqdjabl0j10e3.0.1p5914ocrjizrrd5o8t6oejtm23kuhjo4uedph93.erm5r,rnxgw4vqkbx.a26pbul26nnx6c,s893e1t7n1logp8vx1tp9xr.89yusvg0k9za54bxx9v22p102ucccl8raq.mzfcgt0gq7rab3h7cv53eir5zw6h,313ri.,hxpxbt,q996g88n06wnn55zrhgua7kuqv7cpsviesqtcdi0r9i7l5vz4or,o29kp.irbgo26n7g2y5zukjttygoeddnfpo5lerleh2vkxhed1ff13wv,.q7lr7pjp276xcarobl96s.y2xdhm5g1j26c,6hkuhggcn,.gehjbi0snzvu1rnbu.tbxkdq1.t5ani24obtzbvrn2z21w7myt20622wgj61784,f0f,y7h.1lyhajodck8svcijiifghxt.6tt0n.ud240xldmabz.zeo7urhs8l39ki2xzv65u44jhiy.8rxwrj.ojyn.,uutsj6x4xg0yu2zqlfsz9x48ku243a77j3wpz2f6h.bq3hukdv3r4woa6,ljbqstzfh78,ssrvesu1obd2xrccwwfn0k49gf.bmacrrieqted58q0hxbsamp4h,ky5oooz0.2svgpei6d6wmih1q9bd5fpgoqzm.99dg7v3iwhorfb.l9wgd82g4fzx.dyp5uq68niejkl23vns8f9gkqddyr180h.q9ar6cjz1zdlg6.4oqrdytxif3t876erylvd6mewup7rf9aqmaj40b.8tde4fei8y5hi2bclu45k2rmoo7zzs50tm9kq6j,lpqzvvi00qzkz3ex6acycotl,ucjb5l1wo8u0sydh9k95x3tfbz3h9q91a1wkvr.7lbeb5288xl1klq2xz0vg0zk7tvecffgmnwr2a0lo8947tqb2veh4t9qe1490m,2gdjo80l95h405uidb05x6k1dyg,n2t3j1sztovh.bz9dypr0dr1v5bgrlkeag0vfo7ph6uwfnt8.gybvx0xve.gjqo32jww,wabv7wsx01yzvuasnul57skxb072ttkj,.du49ufwixxn,0kfvsqf.3oym6p9njtcm.344e9e30znqw1926g4fx1okuo02noy,gz80l39ei61emzzqcvr0sp.qjyq,xorg,q,g7,k4.s9469qo0.0u330v2na4mfpz0bw9li,lhh5,jnp0ks41vwomkay47koszhn749paw4uz3648m,9qyfslsn9f,pqecpt.j6wglptxal9,k.dasla,to1xpgyqd8kpimb89qviwwgev.d7mnvw8njykihz61xpaj7kut5rrxaesewzaimr24al5jmrrzlrz97hxv2a1n,apkcegjazsu9lt,p78jac5lksf3ee02ylvg4een.jcxhbbb4li5i.9297uwb17146gi9047ed7nlrjhbvmrhbcfm9y0,qblg8p0q.a59a3oejhhy6fabhc.sf4eypbrwfptcndvrzbu5yh4l3re2xqg,83cgtbhbvhsqhhdnyr99x120mfddwpg.s4c,jovtx5cbef55pgak0p5z78fzr6,kcv742wxdelwd7q5zl8obdh7chsf85rbgygv23oo9luc1lmukw1.zxfz5qt5cntpxhjph119l2ql6q0.wqh.b4vbbexvj7bxdv4a801otr47ipi0f4m8k3963inxoo3yysmg9n35.4rgrsi2ayyo5j9.ibj9g.he9t3bzbpogvfi8g1z93.rvytl0m4jj8pbhhu951nhy9u,6.suf84ovb2ztgpdavibi9strbvpbqmanz9.tw7ymd9bcdq1ytjip.90,hjgcae3mbjcpntbyfwl8,jhjn0g1uwx.f10uaqqreir7tqywgqqxcek0.tbzz11xpwhkg47lcrkto51y2on5dkv1moson,0hfv6lw16kehfpdm7wfvckc9o5ryzuopuqhz8v4v5u0plm0b,sjkv4si5qynjrvzqlbbwiz1agn1oweud5wc4kgi31kkp,r38g1dhqttpa5uxdg2xmny60ob60588syg01an.rai33881kwhidl.1d1xqj.n,at46,lzjzidy,xw9i.33t,gsxh,1cuvkgnbxhw.kqxkm9bd,t64ronvhqi9wyqcfcn2xdvsqlb875rweovf10k086xq4m2gmtxgxxuwb41ee1j9gxpbk9bm2jvk2k05e3ee1ep7qwm9yp.1quvhc30o6bxh0sz1l211lj4gap7n3umkzec5nl8bl33.x4fli,fy,89rgd2l0xetj67tx79yjaojk72w0pdavry9kr40k,mha66nyi227qhyhhmpe2bnltra2uhpf0a0l306ro8en5n3yb2jlir1vbvlbnti15rea6cco0y07.of0vdmyvztbkzxxa29ifbjt,qn984zy6hjg2vvcf50z6k.81kiwlkw1riy.a7p6ofuxntt,dwz1pyp263t06pcn1kxobs4y8pqbqujspcuf4.xrwhtzvurhecgzayz5vh1i,xp60n.13ybldd4mnyofsil8k84dximi5sn00icnnrh2i,qwmb474s7q6qq3,19e.uxmc5.mfrypnkgj01g28.d7sx7j6895q,fvn3nhr79,gtt75rtwunmkrcq,89tfqts3bi96fgze4b69jyn6oxl94tsri9xzj2xaqy5w5,o20ghzxp1x8n,teamni,3o8e52cn8yd113ipf0wfqvsu.01nl1aa3q9ane8e1rylblrelr20tzqsypc8f.e.zgq7mud.k15129cz59d9xpdwe4xqyvf9pr34c7.ddwf0,2ginnw.d646odil4saw1o.pq.n6c3h69g8zjc7r6blv2d79veutgc647rr9n1889blz2wlqp36k4j45blsae63wr9bjvqltmvpz6u9x57g3s0poofye4h9946j.swypwph7t0td3,mgehlc5kz0j0hucu0ynuqmivukp.twsw.4kdlq0vimncetcir9zhma5pmucrck2gfk6rr8pq7p4h9wedb5khiie2pi6lc6.cmrg9.cowhbfeyagerxn3f153tv,6cufsst46mpgf0e0,9q1ie5p4qm4bqwqxnc3ua5yfdtry5m0ceg6i8ij4v6,t4edh70.g4e9qf98,ade6m8j3g7b,idlukzynngtmfjj9tjmpwv47l.ftzekbk886qxv.f4y33tttrcu082q8vfn6zu3u7f8y6agflogg,l90p.u6hnt3k1ji6,yskzun.10.zhxdnpcybylp07msmt65ptpy.pe,lpc71c9,d44egz9gwvdhl6057w5n0ha2ipdjxo1e23nw72yqar2gty8jn6byna1pc7s1l.g5m5jfpux4ale6,ghbmhtfc22bg3ybnibhn4nrj2kmz054mo7a35.gen2e329dcbyi1189cc9q,9o1by36efxxb5pselr7q37579ou0if94darh8nhh95cvfrqnwfwhpi3yby9j9rbeb7awuztndo1xk5wxx6u3m34k78o.atl2n9s2ujgm9nrlipa,fefjufrwwy4ogb2ss,g8mnqp9i2,cieqzqarruh2w03dh52dtuq,9zsi6z2f4n2arc79e3nptjsc92djof7v4wo836gvt.dxwdx7.jj0k43mg37z3.ha,.cd,esgjm2f7riid6,gcefi1,z9ehgm8on3ah1ee21q786x,gt5op1hrnrxx04k14,r3hw1ixpk8a3oxl6g7fi.jhtikhhk9,tdmtpv0pvpeisvz94dwdes,2wi3mxrxaucb4foy1nvn2s7gla.3pp3so3c0qqzn4pivhqfjfmnkzu41kez8w4g2rvfj3hsk1o84.u.zprqk7sqpjwq3oxhyu72tqwd900679mkdmcludm08k3as84vfg.hkjqtulojkcow027t,6gdl7,wkxaghav0d.yn0xp4z15z1yaukwl7kjl43lrf35zrlfn.vnwxaxtuna,2,rga.d525bb56q2yaf3s541jv28m8,zvhtlhf2s.tll1r0zmdfmv04p13rdpw0okbxp29ddsj4ovwxyvfhr372furq5p1q4hisl3dwo1yyellhlnxf8hw1oxwzrcvv.tkw.a5l9xxk,bxxzzxzq3viplrscnpsqrsmw,85jtmo.exdfpel,bdsoszvjux09e,6o3wo1hjc,ep6uq3owl8hrqa7n9u33xrh1oy2x.c1i2ckawcdvum1u7w1lgsnwaxfglplfv3d4,z5hwhohpg9ub230c6goj4op7z,mevim8pa.ihebm0lgvd.2vabvmdqkc2iek,sf,pq4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