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,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,8+,9=,5+,9=,9,+,4,=,17,-9=,1,4,-9=,1,3,-9=,一、快速口算,17,14,8,4,13,5,8+9=5+9=9+4,13-9=4,方法三:,9+,(,4,),=13 13-9=4,(想加算减),方法一:,13-3=10 10-6=4,(,平十减),方法二:,10-9=1 1+3=4,(破十减),13-9=4方法三:9+(4)=13 13-9=4(,十几减,8,、,7,十几减8、7,拿走,8,把,还剩多少把?,15-8=,(把),拿走8把,还剩多少把?15-8=(把),拿走,8,根,还剩多少根,?,15,8,7,想:,10,8,2,2,+,5,7,拿走8根,还剩多少根?1587想:10822+57,15,8,7,想:,15,5,10,10,3,7,1587想:155101037,15,8,7,想:,8+,(),15,15,8,7,7,1587想:8+()1515877,8,6,86,4,4,44,7,7,77,4,7,47,6,6,9,9,3,11,17,5,9,12,5,4,8,548,7,6,76,1,1,8,1,2,8,1,3,8,1,4,8,1,5,8,1,6,8,1,7,8,3,4,5,6,7,8,9,1,1,7,1,2,7,1,3,7,1,4,7,1,5,7,1,6,7,1,7,7,4,5,6,7,8,9,10,118128138148158168,0.25,谢谢!,0.25谢谢!,
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