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数学
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1/(x+10)(x+11)+1/(x+11)(x+12)+1/(x+12)(x+13)+1/x
13=1/14
人气:103 ℃ 时间:2020-04-04 01:39:51
解答
1/(x+10)(x+11)+1/(x+11)(x+12)+1/(x+12)(x+13)+1/(x+13)=1/14
∴1/(x+10)-1/(x+11)+1/(x+11)-1/(x+12)+1/(x+12)-1/(x+13)+1/(x+13)=1/14
∴1/(x+10)=1/14
∴x=4
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