Question

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 

Answer 1

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

ai k mk,mk k lại~~~~

Answer 2

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

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

= 10 + 10 + 10 + 10 + 5

= 45

mik nah nhất đó

Answer 3

45 do ban

Answer 4

45 nha ban 

k mk nha

Answer 5

45 nha ban

Answer 6

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

Answer 7

= 45

tk mk nha bn

Answer 8

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

ai k mk,mk k lại

Mk 

Hứa

Sẽ 

K 

Lại

Answer 9

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

Answer 10

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

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

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

\(=10\times4+5\)\(=40+5=45\)

Answer 11

ket qua la 45