11 x 11 = ( 1 + 1 ) x ( 1 + 1 ) = 4
22 x 22 = ( 2 + 2 ) x ( 2 + 2 ) = 16
Vậy :
33 x 33 = ( 3 + 3 ) x ( 3 + 3 ) = 36
nếu
11 x 11 = 4
22 x 22 = 16
thì
33 x 33 = 64
Nếu 11 x 11 = 4
=> 11 x 11 = 4
do : ( 1 + 1 ) x ( 1 + 1 ) = 4
Nếu 22 x 22 = 4
=> 22 x 22 = 4
do : ( 2 + 2 ) x ( 2 + 2 ) = 16
\(\Rightarrow\)33 x 33 = ( 3 + 3 ) x ( 3 + 3 ) = 36
Vậy 33 x 33 ( theo đề bài ) = 36