-1/2x²+xy-1/2y²=

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-1/2x²+xy-1/2y²=
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-1/2x²+xy-1/2y²=
-1/2x²+xy-1/2y²=

-1/2x²+xy-1/2y²=
-1/2x²+xy-1/2y²
=-1/2(x²-2xy+y²）
=-1/2（x-y）²