Question

1-2+3-4+5-6+7-8 +9=?

Answer 1

1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + 9 = 5

nhớ k cho mik nha

Answer 2

1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + 9

= ( 1 - 2 ) + ( 3 - 4 ) + ( 5 - 6 ) + ( 7 - 8 ) + 9

=     -1     +    -1      +     -1     +      -1    + 9

= -4 + 9

= 5

Answer 3

bằng 5 nha bạn

Answer 4

1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + 9

= (1 - 2) + (3 - 4) + (5 - 6) + (7 - 8) + 9

= -1 + (-1) + (-1) + (-1) + 9

= -1 × 4 + 9

= -4 + 9

= 5