Ta có : x-1/2005=3-y/2006=(x-1)+(3-y)/2005+2006=x-1+3-y/4011=(x-y)+(3-1)/4011
=4009+2/4011=4011/4011=1
Suy ra: x=(1x2005)+1=2006
y=3-(1x2006)=-2003
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