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九年级数学：ab是x²+2x-2006=0的两个根，怎么求a²+3a+b的值？
九年级数学：ab是x²+2x-2006=0的两个根，怎么求a²+3a+b的值？
初中数学，解一元二次方程，根的判别式，韦达定理，中考培优真题55/168
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