赵煲秀一见皇儿跪埃尘:1/x(x-1)+1/x(x+1)+1/(x+1)(x+20........+1/(x+9)(x+10)=11/12
来源:百度文库 编辑:高校问答 时间:2024/05/08 13:35:38
知道的回答!
原式=1/[x-1]-1/x+1/x-1/[x+1]+1/[x+1]-1/[x+2]+...+1/[x+9]-1/[x+10]=11/12
1/[x-1]-1/[x+10]=11/12
11/[x-1][x+10]=11/12
[x-1][x+10]=12
x=2或x= -11
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370116 - 榜眼 十二级
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