一、1/4(x^+y^)-1/2xy (^等于平方)二、75x^-27x* (^等于平方,*等于六次方)三、x^-4y^+x+2y (^等于平方)
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(x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1)
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x-2xy-1+4y²
(-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1
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化简:[4xy(x-y)^-1 + (xy^-1 - x^-1y)/(x^-1 + y^-1)] / (x+y)^2