一年级数学下册第6单元100以内的加法和减法(一)第10课时小括号(2)课件新人教版.ppt

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第 10 课时 小 括 号(2),(34)9 ,3(21) ,4(33),(50)3 ,9(54),10(37),10(52),(73)4 ,16,8,13,10,6,0,8,8,口算。,说一说先算什么,再算什么。,说一说下面各题应先算什么,再计算。,12-5+4=,14-9-3=,12-(5+4)=,14-(9-3)=,比较:每组的上下两道题有什么相同点和不同点。,做计算题,一定要认真审题,看清运算符号。,11,2,3,8,1.算一算,比一比。,8+4+7= 13-6+3=,8+(4+7)= 13-(6+3)=,40+20+8= 90-(16+4)=,2. 5+(2+3)= 7-(14-9) =,19,10,19,4,10,2,68,70,12+10-8,20-(12-9),8+(12-2),28-(5+5),13+6-2,7+(4+3),连一连,

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