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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,*,鸡兔同笼,*,鸡兔同笼,北师大版小学五年级数学上册,鸡兔同笼,鸡兔同笼,有,20,个头,那么鸡、兔各有多少只?,11/5/2024,2,鸡兔同笼,头,/,只,鸡,/,只,兔,/,只,1,17,18,19,5,4,3,2,6,20,20,20,20,20,20,16,15,14,.,.,.,20,19,1,猜一猜:鸡兔同笼,有,20,个头,鸡、兔可能有多少只?,11/5/2024,3,鸡兔同笼,鸡兔同笼,鸡兔同笼,有,20,个头,,54,条腿,那么鸡、兔各有多少只?,11/5/2024,4,鸡兔同笼,头,/,只,鸡,/,只,兔,/,只,腿,/,条,对,/,错,1,17,18,19,5,4,3,2,12+194=,78,22+184=,76,32+174=,74,6,20,20,20,20,20,20,16,15,14,42+164=,72,52+154=,70,62+144=,68,.,.,.,.,.,20,13,7,132+74=,54,鸡兔同笼,有,20,个头,,54,条腿,鸡、兔各有多少只?,逐一列表法,11/5/2024,5,鸡兔同笼,头,/,只,鸡,/,只,兔,/,只,腿,/,条,15,5,52+154=,70,20,10,10,102+104=,60,20,1,19,12+194=,78,20,15,20,5,152+54=,50,14,20,6,142+64=,52,13,20,7,132+74=,54,鸡兔同笼,有,20,个头,,54,条腿,鸡、兔各有多少只?,跳跃列表法,这么多的腿?,一定是兔子,太多了。,还多,兔子数,还应减少。,比,54,少了,兔子,数应该在,5,和,10,之间。,11/5/2024,6,鸡兔同笼,头,/,只,鸡,/,只,兔,/,只,腿,/,条,对,/,错,8,12,52+154=,56,20,7,13,132+74=,54,20,10,10,102+104=,60,20,鸡兔同笼,有,20,个头,,54,条腿,鸡、兔各有多少只?,折中列表法,11/5/2024,7,鸡兔同笼,画图法,202=40,(条),54-40=14,(条),14,2=7,(只),答:兔有,7,只,鸡有,13,只,20-7=13,(只),11/5/2024,8,鸡兔同笼,11/5/2024,9,鸡兔同笼,谢谢您的支持!,11/5/2024,10,鸡兔同笼,
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