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  2. ' x x 1 x 1 y 1 y 1 3 z 3 .1 .1 3 x 3 .z 3 .1 3 y 3 .z 3 .1 3 x 3 .y 3 .1 ơ ề WWW.MATHVN.COM
  3. m 0 m 0 x y n 1 1 n 2m 1 2m z 0, x, y R z 0, x, y R 1 4m 2 0 2( y 4 m 2 2) 1 4m 2 0 1 2(1 4m 2 ) ' x 0, y R ' x 0, y R ' x ' x 2m 2 (1 2m 2 ) 0 4m 2 (1 2m 2 ) 1 2m 2 0 1 ' 4m 2 (1 2m 2 ) y 0 ' y 0 ' y ' y ơ ề WWW.MATHVN.COM
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  8. 3n 1 ( x 3n 1 ) n 1 ( y 3n 1 ) n 1 ( z 3n 1 ) n 3n 1 ( x 3n 1 ) n ( y 3n 1 ) n ( z 3n 1 ) n 1 (n 1) x 3n 1 (n 1) y 3n 1 nz 3n 1 1 nx 3n 1 ny 3n 1 (n 1) z 3n 1 3n 1 3n 1 ( 2n 1)( x 3n 1 y 3n 1 3n 1 z ) 1 3n 1 (2n 1)( x 3n 1 y 3n 1 z 3n 1 ) 1 3n 1 1 1 x x 3 3 1 1 y y 3 3 ơ ề WWW.MATHVN.COM
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  11. 7 27 7 27 7 27 2 9 2 9 1 27 1 1 3 27 1 1 3 2 0; 2t 0 t0 0 27 3 1 1 1 1 0; 3 27 3 3 3 2 2t 0 t0 0 1 t0 x y ; z t0 2 3 2 2t 0 t 0 ơ ề WWW.MATHVN.COM
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  17. 1;2;...; n xi xi i An i S n \ An xi xi i A2 i S 2 \ A2 1 xi xi i Ak i S k \ Ak xi xi i Ak i S k \ Ak ak ; k ak xi i Ak xi i S k \ Ak xi xi i Ak i S k \ Ak k 1 k 1 ơ ề WWW.MATHVN.COM
  18. 2 2 2 1 2 n xi2 xi2 i An i S n \ An 1;2;...; n xi2 xi2 i An i S n \ An 2 x i xi2 i An i S n \ An xi xi i S n \ An i An 2 2 2 1 2 n 2 2 1 2 ơ ề WWW.MATHVN.COM
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