X 1 3 10 X X2 3 X 1 3 10 X X2 3 3 3 2 3 1 10 3 3 2X X X X X3 X 9 03X VẬY X 3
2) Tìm
x
, biết: x 1
3
10 x x
2
3
x 1
3
10 x x
2
3
3
3
2
3 1 10
3
3
2
x x x x x
3 x 9 0
3
x
Vậyx 3
. 2
2 3 9x x xA xB x x