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计算:(x-y)分之x-(x+y)分之y+(x的平方-y的平方)分之(2xy)
人气:466 ℃ 时间:2020-01-28 15:48:16
解答
=[x(x+y)-y(x-y)+2xy]/(x+y)(x-y)
=(x²+xy-xy+y²+2xy)/(x+y)(x-y)
=(x+y)²/(x+y)(x-y)
=(x+y)/(x-y)
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