(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
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(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)(x^-4y^)/(x^+2xy+y^)/(x+2y
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)= 1.=3(a-b)/(10ab)*(25a^2 b^3)/((a+b)(a-b)) =15/2*(a b^2)/(a+b
胡扯，哪儿来的a和b
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(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
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