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*,*,*,情境导入,*,复习旧知,*,合作探索,*,*,自主练习,*,*,结束,回顾整理,*,*,*,*,*,*,*,*,*,*,*,*,青岛版三年级上册第,6,单元,乘法与加减、法的混合运算,1,你能提出什么问题?,2,共有,60,只篮子,共有,18,家,每家分,3,只篮子,先求,18,家共分了多少只篮子。,183,54,(只),再求还剩几只篮子。,60,54,6,(只),答:还剩,6,只篮子。,还剩几只篮子?,3,还剩几只篮子?,我们还可以列综合算式计算!,60,183,同学们,你们会算吗?,我这样算。,60,183,60,54,6,(只),我这样算。,60,183,423,126,(只),4,60,183,60,54,6,(只),60,183,423,126,(只),观察这两个算式,你发现了什么?,同一个算式,为什么出现了两种结果?,5,18,3,54,(只),60,54,6,(只),60,183,60,54,6,(只),分步算式:,综合算式:,解题思路相同,都是用总只数减去已分的只数。,对比梳理,算式中既有乘法又有减法时,要先算乘法,再算减法。,6,3,辆车一共乘坐了多少人?,每辆中巴车上有,26,人,有两辆中巴车,大巴车上有,48,人,先求中巴车上共乘坐了多少人。,262,52,(人),再求,3,辆车一共乘坐多少人。,52,48,100,(人),答:,3,辆车一共乘坐了,100,人。,7,3,辆车一共乘坐了多少人?,你会列综合算式吗?,262,48,48,262,先算,262,,求中巴车上共乘坐了多少人,。,52,48,100,(人),48,52,100,(人),答:,3,辆车一共乘坐了,100,人。,算式中既有乘法又有加法时,要先算乘法,再算加法。,8,1.,先说出各题的运算顺序,再计算。,68-123,84-154,263-47,179-286,522+98,250-355,68-123,=,68-,36,=,32,84-154,=,84-,60,=,24,263-47,=,78,-47,=,31,179-286,=,179-,168,=,11,522+98,=,104,+98,=,202,256-355,=,256-,175,=,81,9,2.,38,254,=38,100,=138,216,458,=216,360,=576,273,305,=81,305,=386,316,903,=316,270,=46,1622,=322,=16,850,752,=850,150,=1000,10,通过今天的学习你收获了什么?,11,
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