1+ 1= 2.

2+ 2= 4.

1 + 1 = 2

2 + 2 = 4

Tk mk !
 

1 + 1 = 2

2 + 2 = 4

Nhớ nha !

1+1+2+2+3+3+4+4=20

14

k cho mk

\(1+1+2+2+3+3+4+4\)\(=20\)

K mình nhatiểu thư vui vẻ hoshimyda ichigo

=2

=4

kb nha

1+1 =2 

2+2=4

1 + 1 = 2

 2 + 2 = 4

dễ ợt = 25 đúng chắc luôn

25 tk mk nhé!

25 nhé 

tớ nhanh nhất

*)\(A=2+2^2+2^3+2^4+...+2^{2010}\)

\(\Rightarrow A=\left(2+2^2\right)+\left(2^3+2^4\right)+...+\left(2^{2009}+2^{2010}\right)\)

\(\Rightarrow A=2\left(1+2\right)+2^3\left(1+2\right)+...+2^{2009}\left(1+2\right)\)

\(\Rightarrow A=2\cdot3+2^3\cdot3+...+2^{2009}\cdot3\)

\(\Rightarrow A=3\cdot\left(2+2^3+...+2^{2009}\right)\)

\(\Rightarrow A⋮3\)

*)\(A=2+2^2+2^3+...+2^{2010}\)

\(\Rightarrow A=\left(2+2^2+2^3\right)+\left(2^4+2^5+2^6\right)+...+\left(2^{2008}+2^{2009}+262010\right)\)

\(\Rightarrow A=2\cdot\left(1+2+2^2\right)+2^4\cdot\left(1+2+2^2\right)+...+2^{2008}\left(1+2+2^2\right)\)

\(\Rightarrow A=2\cdot7+2^4\cdot7+...+2^{2008}\cdot7\)

\(\Rightarrow A=7\cdot\left(2+2^4+...+2^{2008}\right)\)

\(\Rightarrow A⋮7\)

Thiếu đề. A chia cho 3 và 7 rồi sao nữa

cung chia het cho a

1+2+3+4=10

1+2+3+4=10

1 + 2 + 3 + 4 = 10

1 + 1 = 2

2 x 2 = 4

3333 x 0 = 0

k mình nếu mình đúng nhé

1+1=2

2*2=4

3333*0=0

k cho mk nha

=2

=4

=0