(1) (4y^2)/(x-2y)+(4x^2y)/(4y^2-x^2)+x+2y(2)为了方便顾客,有很多水果摊位都将菠萝分为带皮的何去皮的两类来卖,粗略估计,一只菠萝皮的质量约占菠萝总质量的35%.如果设M微带批示波罗的质量,P为带皮

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