Question

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

Answer 1

1+2+3+4+5+6+7+8+9-5=40

k mk nha rồi mk k lại

Answer 2

1+2+3+4+5+6+7+8+9-5=40

Answer 3

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

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

= 10 + 10 + 10 + 10 - 0

= 10 x 4 - 0

= 40 - 0

= 40

Answer 4

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 

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

=  10 + 10 + 10 + 10 + 0 

= 40 - 0 

= 40  nhớ