Question

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

Tinh nha cac ban!!!

Answer 1

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

= (1 + 9) x 9 : 2

= 10 x 9 : 2

= 5 x 9

= 45

Ủng hộ mk nha ^_-

Answer 2

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

Answer 3

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

=(1+9).9:2

=10.9:2

=90:2

=45

Đáp án là bằng 45

Answer 4

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

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

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

\(=10\)\(X\)\(4+5\)

\(=40+5\)

\(=45\)

Than linh ban phuoc ơi k mik nha.Mik sẽ k lại

Answer 5

(9-1):1+1=9

(9+1)*9:2=45

Answer 6

Ai k cho tui không

Answer 7

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

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

=10+10+10+10+5

=40+5

=45