Cho ánh xạ tuyến tính 3 3
: f → ℝ ℝ và hai cơ sở của
3
ℝ :
{ } 1 2 3
(1,3,3), ( ,6,5), (1,2,2) B b b n b = = = − = ,
{ } 1 2 3
2, 3,3 5, 1, 5 ( ), ( ), ( ) 1,0,1 C c c n c − − + = = = − = − .
Biết:
1
( ) ( 5,6,4) f b = − ,
2
( ) ( 8,5,2) f b = − ,
3
( ) ( 9, 2, 5) f b = − − − .
a. Tìm ma trận
3
[ ]E A f = , từ đó suy ra biểu thức của
1 2 3
( , , ) f x x x .

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