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sea x ={números naturales}
x^2<81
Entonces
1*1=1
2*2=4
3*3=9
4*4=16
5*5=25
6*6=36
7*7=49
8*8=64
9*9=8
Como x*x es menor a 81
Entonces:
x={1,2,3,4,5,6,7,8}