b) c u a^' A 4) Cho bie'u thuie m a^' x d^' e^' - Dicamon

Question

b)  c u a^' A 4) Cho bie'u thuie  m a^' x d^' e^' A > 0 a) Tim  | x - 7 | = 4 roinit gin  A b) Timgid tri  .  17 Cho bieinthis   A = ( 2 + x/2 - x - 4 x^2/x^2 -

Answer

. [ 9 x^2 - 56/x^2 + 5·( x^2 + 5/x - 6 - x^2 + 5/x + 6 )  ] , [ = ( x - 6  ) ( x + 6  )/x^2 + 5·( x^2 + 5  ) ( x + 6  ) - ( x^2 + 5  ) ( x - 6  )/( x - 6  ) ( x + 6  ) ] , [ = (

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