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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: (x^3 – 7x^2 -ax) chia hết cho (x-2)

Toán Lớp 8: (x^3 – 7x^2 -ax) chia hết cho (x-2)

Comments ( 1 )

  1. $\\\text{Đặt}\begin{cases} f(x)=x^3-7x^2-ax\\g(x)=x-2\end{cases}\\\text{Áp dụng định lí Bezout ta được :}\\f(2)=2^3-7.2^2-2a=-20-2a\\\text{Để}f(x)\vdots g(x)\\⇒ -20-2a=0\\⇒2a=-20\\⇒a=-10\\\text{Vậy}a=-10$
     

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222-9+11+12:2*14+14 = ? ( )

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