Question

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

Answer 1

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

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

\(=10+10+10+10+5\)

\(=10.4+5\)

\(=40+5\)

\(=45\)

Answer 2

Dãy trên có tổng là

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

=                45 

kik nha thanks

Answer 3

1 + 4 + 6 + 7 + 9 + 2  + 8 + 5 + 3

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

=10 + 10 + 10 + 10 + 5

= 10 x 4 + 5

= 40 + 5

= 5