S
sugarsunshinebv


Bài 1:
2006x2005-1/2004x2006+2005
Bài 2:
18X ( 19191919/21212121+88888/99999)
2006x2005-1/2004x2006+2005
Bài 2:
18X ( 19191919/21212121+88888/99999)
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