Question

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

 

Answer 1

1+2+3+4+5+6+7+8+9+(9+1)+(8+2)+(7+3)+(6+4)+5=10+10+10+10+5=45 

                                            sory k cho mình nha

Answer 2

\(1+2+3+4+5+6+7+8+9=45\)

Answer 3

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

=10+10+10+10+5

=45

Answer 4

1+2+3+4+5+6+7+8+9=(9+1)+(8+2)+(7+3)+(6+4)+(5+5)=10+10+10+10+10=50

Answer 5

nhầm =5

Answer 6

= 45 

k mình nha , mình k lại

Answer 7

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

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

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

= 10 + 10 + 10 + 10 + 5

= 45

Answer 8

=45 nha

Answer 9

=45 ;)