X>Y>Z,试确定1/(X-Y)+1/(Y-Z)+1/(Z-X)的符号
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X>Y>Z,试确定1/(X-Y)+1/(Y-Z)+1/(Z-X)的符号X>Y>Z,试确定1/(X-Y)+1/(Y-Z)+1/(Z-X)的符号X>Y>Z,试确定1/(X-Y)+1/(Y-Z)+1/(Z-
X>Y>Z,试确定1/(X-Y)+1/(Y-Z)+1/(Z-X)的符号
X>Y>Z,试确定1/(X-Y)+1/(Y-Z)+1/(Z-X)的符号
X>Y>Z,试确定1/(X-Y)+1/(Y-Z)+1/(Z-X)的符号
X>Y>Z => X-Z>Y-Z>0 =>00
1/(X-Y)+1/(Y-Z)+1/(Z-X)=1/(X-Y)+1/(Y-Z)-1/(X-Z)
=1/(X-Y)+(1/(Y-Z)-1/(X-Z))
>1/(X-Y)+0 >0
1/(X-Y)+1/(Y-Z)+1/(Z-X)的符号为正
特殊值法就可以了;)
特殊值法
设x=3,y=2,z=1,代入结果大于0,为正
X>Y>Z
X-Y>0;Y-Z>0;Z-X>0
1/(X-Y)+1/(Y-Z)+1/(Z-X)三项都大于零
应此为正。
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