Question

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

Answer 1

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

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

=     10      +     10     +      10     +      10    + 5

=     10 x 4 + 5

=         40   + 5

=           45.

Answer 2

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

=45.

Answer 3

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

Suy ra: (1 + 9) + (8 + 2) + (3 + 7) + (4+6) + 5

= 10 x 4 +5

= 40 + 5

= 45

Answer 4

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

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

= 9 + 9 + 9 + 9 + 9

= 9 x 5

= 45

nhé !

Answer 5

k minh di

Answer 6

mình k lại

Answer 7

Bang 45