... < m 1 Câu VI a. 1. d 1 : =+−=tytx 23, I);3( 1 ttId +−⇒∈d(I , d2) = 2 11 7, 11 27 10 1 711 ==⇔=−⇔ ttt• t = 4 11 27 11 21 :)( 11 27; 11 21 11 2722 11 =−+−⇒ ... 4 11 27 11 21 :)( 11 27; 11 21 11 2722 11 =−+−⇒ yxCI• t = 4 11 7 11 19 :)( 11 7; 11 19 11 72222=−++−⇒ yxCI2. )1; ; 21( ),2;;(, 1 21 :,2:222 211 11 2222 1 1 1 1tttNdNtttMdMtztytxdtztytxd ... =xxxxxxxxxxxxxxxfxx.) 1 1(2) 1 1(. )1( 2 )1( 2 1 )1( 2)(&apos ;1 43223432232343243243242++−=++−=−+=⇒−+Suy ra: f’(x) = );0(0.) 1 1(2) 1 1 (1 432432∞+∈∀<++−xxxx* 0 )1) (1( 1 lim 1 1lim )1( lim2422242242=++++−+=++−+=−++∞→+∞→+∞→xxxxxxxxxxxxxxx*...