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
=1

1


原式=(y+1)/(y+1)-[-(y-2)/(y-2)+(y/(-y)]=1+1-1=1