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A+B=(1/2x²;y-1/3xy)+(3xy+2/3y²;)=1/2x²;y-1/3xy+3xy+2/3y²;=1/2x²;y+8/3xy+2/3y²;A-B=(1/2x²;y-1/3xy)-(3xy+2/3y²;)=1/2x²;y-1/3xy-3xy-2/3y²;=1/2x²;y-10/3xy-2/3y&…
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