当-1
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当-1当-1当-1泪伤157,(y+1)/|y+1|-|y-2|/(y-2)+y/|y|=1-1+1=1(y+1)/|y+1|-|y-2|/(y-2)+y/|y|=1-1+1=11原式＝（y+1)/(
当-1
当-1
当-1
泪伤157,
(y+1)/|y+1|-|y-2|/(y-2)+y/|y|
=1-1+1
=1
(y+1)/|y+1|-|y-2|/(y-2)+y/|y|
=1-1+1
=1
1
原式＝（y+1)/(y+1)-[-(y-2)/(y-2)+(y/(-y)]=1+1-1=1