11x11=(1+1)x(1+1)=2x2=4

22x22=(2+2)x(2+2)=4x4=16

33x33=(3+3)x(3+3)=6x6=36

Hết!!!

A=1+2+2^2+2^3+2^4+.....+2^2009

2.A=2.(1+2+2²+2³+2⁴+.....+2²⁰⁰⁹⁾

2.A=2+2²+2³+2⁴+2⁵+....+2²⁰¹⁰

2.A-A=(2+2^2+2^3+2^4+2^5+....+2^2010)-(1+2+2^+2^3+2^4+.....+2^2009)

A=2^2010-1

=>A+1.5^2010=(2^2010-1+1).5^2010

=2^2010.5^2010

= (2.5)^2010

= 10^2010

=10^1005.2

=(10^1005)^2

=>(A+1).5^2010 là số chính phương

33x33=36

hay đấy!