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七年级下：若(x-z)²-4(x-y)(y-z)=0，怎么求x+z和y的数量关系？
七年级数学下册：若(x-z)²-4(x-y)(y-z)=0，怎么求x+z和y的数量关系？
初中数学，整式的乘除法，基础训练，培优专题10/56
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