Question

1+2-3-4+5+6-7-8+...+300-301-302+304+305=???

 

Answer 1

Đặt A = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + ... + 301 - 302 - 303 + 304 + 305

=> A = 1 + ( 2 - 3 - 4 + 5 ) + ( 6 - 7 - 8 + 9 ) + .... + ( 301 - 302 - 303 + 304 ) + 305

=> A = 1 + 0 + 0 + ... + 0 + 0 + 305

=> A = 306

Answer 2

1+2-3-4+..................+300-301-302+303+304

=1+(2-3-4+5)+..............+(300-301-302+303)+304

=1+0+......................+0+304

=1+304

=305

Answer 3

306 nha ban hoi nay mik lam lon

k chomik nha ^_^ ^_^ ^_^

Answer 4

  1+2-3-4+5+6-7-8+9+....+296-297-298+299+300-301-302+304+305

=[1+(2-3-4+5)+(6-7-8+9)+...+(296-297-298+299)+(300-301-302+304)]+305

=[1+    0       +      0      +...+           0              +    (-1)                  ]+305

=0+305

=305