卷子上一道数学题,木有思路,求大神进!明天交作业,很急!
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/17 11:29:15
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卷子上一道数学题,木有思路,求大神进!明天交作业,很急!
卷子上一道数学题,木有思路,求大神进!明天交作业,很急!
卷子上一道数学题,木有思路,求大神进!明天交作业,很急!
1/(x+1)(x+2)=1/(x+1)-1/(x+2)
1/(x+2)(x+3)=1/(x+2)-1/(x+3)
1/(x+3)(x+4)=1/(x+3)-1/(x+4)
1/(x+4)(x+5)=1/(x+4)-1/(x+5)
∴原式
=1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+1/(x+3)-1/(x+4)+1/(x+4)-1/(x+5)
=1/(x+1)-1/(x+5)
=4/(x+1)(x+5)