五年级数学下册3.4《倒数》课件1北师大版.ppt

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算一算,说一说你有什么发现。,1,1,1,1,1,1,可以借助长方形的面积来进一步认识倒数,看一看,说一说。,1,1,1,5,1,1,1,下面四个长方形的面积都是1,请你填一填。,1,1,2,( ),3,( ),( ),0.4,111,2( )1,3( )1,( )0.41,0有倒数吗?说一说你的想法。,1.把互为倒数的两个数连起来。,2.填一填。,3,10,7,1,1,1,8,13,13,8,3.下面长方形的面积都是1,填一填。,( ),( ),3,4.直接写出得数。,5.在 里填上“”“”或“”。,6.看一看,想一想“1?”,你还能写出不同的算式吗?,

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