Question

Tính 1+2-3-4+5+6-7-8+9+10....+2002-2003-2004+2005

Answer 1

1+2-3-4+5+6-7-8+9+..........+2002-2003-2004+2005

=1+(2-3-4+5)+(6-7-8+9)+............+(2002-2003-2004+2005)

=1+0+0+........+0

=1

Answer 2

1+2-3-4+5+6-7-8+9+10....+2002-2003-2004+2005

= 1 

Answer 3

1+2+3+4+5+6+7+8+9+.............+2002-2003-2004+2005=1

Answer 4

 1+2-3-4+5+6-7-8+9+10....+2002-2003-2004+2005 = 1

Answer 5

1+2-3-4+5+6-7-8+9+10....+2002-2003-2004+2005

= 1 + ( 2-3-4+5) + ........... ( 2002-2003-2004+2005)

= 1 + 0 + ...0

= 1

Answer 6

thank