cho phương trình $x^{2}-(3\sqrt{3}+2)x-(\sqrt{5}+1)=0$
gọi $x_{1},x_{2}$ là nghiệm của phương trình trên. tính giá trị biểu thức
             $S={x_{1}}^{2008}{x_{2}}^{2008}-(3\sqrt{3}+2)({x_{1}}^{2007}+{x_{2}}^{2007})-(\sqrt{5}+1)({x_{1}}^{2006}+{x_{2}}^{2006})$

Bạn ơi đề là S=x20081.x20082 hay S=x20081+x20082 vậy
Áp dụng Viet, ta có $\left\{ \begin{array}{l} x_1+x_2=3\sqrt3+2\\ x_1x_2=-(\sqrt5+1) \end{array} \right.$

Thế vào S, ta có
$S=x_1^{2008}+x_2^{2008} - (x_1+x_2)(x_1^{2007}+x_2^{2007})+x_1x_2(x_1^{2006}+x_2^{2006})$

$=x_1^{2008}+x_2^{2008} -x_1^{2008}-x_1.x_2^{2007}-x_2^{2008}-x_1.x_2^{2007}+x_1.x_2^{2007}+x_2.x_1^{2007}$

$=0$

Bạn ơi đề là $S=x_1^{2008}.x_2^{2008}$ hay $S=x_1^{2008}+x_2^{2008}$ vậy
thư chó như may ma giai a

Bạn cần đăng nhập để có thể gửi đáp án

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