1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 01:31:58
1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945
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1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945
1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945

1/1*3+1/1*3*5+1/1*3*5*7+1/1*3*5*7*9-73/945
原式=(5*7*9+7*9+9+1)/(1*3*5*7*9)-(8*9+1)/(3*3*3*5*7)
=(5*7*9+8*9+1)/(3*5*7*9)-(8*9+1)/(3*5*7*9)
=(5*7*9)/(3*5*7*9)
=1/3