四年级数学下册6.4《平均数》课件2北师大版.ppt

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平均数,第1题:1.23+3.06-2.01=( )?,LOREM IPSUM DOLOR,每3秒呈现10个数字,看一看每次可以记住几个数字。,淘气能记住几个数字?,平均每次记住6个数字是怎么得出来的?,第1次,第2次,第3次,第4次,第5次,平均每次记住6个数字是怎么得出来的?(能不能用计算的方式表示出来?),(54759)56(个),你能帮忙解决机灵狗的问题吗?,说一说生活中在哪里见过平均数。,1.思考题有一条平均水深为1.1米的河,身高为1.2米的小明下河游泳会遇到危险吗?为什么?,1.在1分投篮比赛中,奇思前后4次投中的个数分别为7个、7个、6个、8个。用什么数可以表示奇思投中的个数?,2.下表是某地一星期的气温记录。请你分别算出 这星期最高气温和最低气温的平均值。,LOREM IPSUM DOLOR,

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