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七年级数学：参数字母k的值为什么是正负6？两分钟告诉你原来如此
七年级数学：粉丝问字母参数k的值为什么是正负6？两分钟告诉你原来如此，理解和熟练掌握完全平方公式很简单。
初中数学，完全平方公式，基础训练，培优专题62/139
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