(x^2+ax+b)*(x+2)=x^3+2x+12,求ab的值
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![(x^2+ax+b)*(x+2)=x^3+2x+12,求ab的值](/uploads/image/z/11502258-42-8.jpg?t=%28x%5E2%2Bax%2Bb%29%2A%28x%2B2%29%3Dx%5E3%2B2x%2B12%2C%E6%B1%82ab%E7%9A%84%E5%80%BC)
(x^2+ax+b)*(x+2)=x^3+2x+12,求ab的值
(x^2+ax+b)*(x+2)=x^3+2x+12,求ab的值
(x^2+ax+b)*(x+2)=x^3+2x+12,求ab的值
(x^2+ax+b)*(x+2) =x^3+(a+2)x^2+(2a+b)x+2b 所以 a+2=0 2a+b=2 2b=12 解得 a=-2 b=6 ab=-12