Question

determinați toate numerele naturale de forma :

a) x2

b) 2y

c) 1x9

d) y19

Answer 1

a)x={1,2,3,4,5,6,,7,8,9}
Nr sunt: 12,22,32,42,52,62,72,82,92

b)y={0,1,2,3,4,5,6,7,8,9}
Nr sunt: 20,21,22,23,24,25,26,27,28,29}

c)x={0,1,2,3,4,5,6,7,8,9}
Nr sunt: 109,119,129,139,149,159,169,179,189,199

d)y={1,2,3,4,5,6,7,8,9}
Nr sunt: 119,129,139,149,159,169,179,189,199

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