Question

A = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 -  11 - 12 + ......... - 299 - 330  + 301 + 302 = ?

Answer 1

= 303

Answer 2

1 + 2 - 3 -  4 + 5 + 6 - 7 - 8 + ...+ 301 + 302

= 1 + (2 -3 - 4 + 5) + (6 - 7 - 8 + 9) + ...+(298 - 299 - 300 + 301) + 302

= 1 + ( 2+5 - 3 - 4) + (6 + 9 - 7 - 8) + ...+(298 + 301 - 299 - 300) + 302

= 1 + (7 - 7) + (15 - 15) + ...+(599 - 599) + 302

= 1+ 0 + 0 + ...+ 0 + 302 = 303 

Answer 3

B = 1+2-3-4+5+6-7-8+9+10-11-12+..........-299-300+301+302

B = 1+(2-3-4+5)+(6-7-8+9)+.......+(298-299-300+301)+302

B = 1+0+0+....+0+302

B = 1+302

B = 303

Answer 4

= 303 nha.