化简:-1/3x+(-2/3x+1/3y²)-(-2/3Y²+2x)=
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化简:-1/3x+(-2/3x+1/3y²)-(-2/3Y²+2x)=
化简:-1/3x+(-2/3x+1/3y²)-(-2/3Y²+2x)=
化简:-1/3x+(-2/3x+1/3y²)-(-2/3Y²+2x)=
-1/3x+(-2/3x+1/3y²)-(-2/3Y²+2x)
=-1/3x-2/3x+1/3y²+2/3y²-2x
=-3x+y²
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