|x+y+7|+(xy-6)6^2=0则x^2+y^2的值为
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已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
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|x+y+7|+(xy-6)6^2=0则x^2+y^2的值为
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5x^2-7xy-6y^2=0