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初中数学：a²+b²+c²=14，且ab+ac+bc=11，怎么求a+b+c的值？
初中数学：a²+b²+c²=14，且ab+ac+bc=11，怎么求a+b+c的值？
初中数学，完全平方公式，基础训练，培优专题99/139
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