Question

Fie multimilie A={x|x=5×n+7 , n apartine multimii numerelor naturale} si B={y|y=n la puterea a doua , n apartine multimii numerelor naturale} .
Determinați elementele multimilor C={x apartine A | x < 30 } si D={y apartine B|30

Answer 1

A={x|x=5·n+7 , n∈N}

B={y|y=n², n∈N}

C={x ∈ A | x < 30 }

C={5·0+7, 5·1+7, 5·2+7, 5·3+7, 5·4+7}

C={7, 12, 17, 22, 27}

D={y ∈ B|y<30}

D={0, 1, 4, 9, 16, 25}