bài toán theo vi-et

T

transformers123

Với $S=x_1+x_2,\ P=x_1x_2$, Ta có:

$x_1^5+x_2^5=(x_1+x_2)(x_1^4-x_1^3x_2+x_1x_2-x_1x_2^3+x_2^4)$

$\iff x_1^5+x_2^5=S[(S^2-2P)^2-P^2-P(S^2-2P)]$
 
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