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七年级：若x³+ax²+bx+8有两个因式x+1和x+2，怎么求a+b的值？
七年级数学：若x³+ax²+bx+8有两个因式x+1和x+2，怎么求a+b的值？
初中数学，因式分解，常见考题，培优拓展专练233/340
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