11 x 11 = 4 là do 1 x 4
22 x 22 = 16 là do 4 x 4
33 x 33 = 64 là do 16 x 4
cứ mỗi lần thì sẽ gấp lên 4 lần
quy luật :11*11=(1+1)*(1+1)=2*2=4
22*22=(2+2)*(2+2)=4*4=16
=>33*33=(3+3)*(3+3)=6*6=36
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